ÿWPCL ûÿ2BJ|xÐ ` ÐÐÌÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿH øÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÌÐÐ °°°è ÐÑ Âx„|ü@Ž ÑÐ Å°6Ø'°6Ø'Å ÐÕYÏ Ð ` Ð Áà@Á©  ©ƒ Áà<ÁAP IX©144©Eƒ ÁàAÁƒYÕÕYÏ Ð ` Ð Áà@Á©  ©ƒ Áà<ÁAP IX©144©Eƒ ÁàAÁƒYÕÕI(3293) ÕÕI(3293) ÕÐ °èè ÐÓÓÃÃRecommendation I.231 © Circuit©mode bearer service categoriesÄÄ 1.ÁHÁÃÃGeneralÄÄ ÁHÁRecommendation I.210 describes the principles for defining telecommunication services supported by an ISDN including the concept of bearer services, teleservices and supplementary services. It also provides the means for the definition and description of such services. A recommended set of circuit©mode bearer services categories is defined in Recommendation I.230. Ð H ÐÁHÁThe purpose of this Recommendation is to describe circuit©mode bearer services categories, to describe individual circuit©mode bearer services, and to recommend their provision in ISDN. The definitions and descriptions form the basis to define the network capabilities required for the support of the services in ISDN. ÁHÁBearer service categories are described by prose definitions and descriptions, by attributes and their values and by dynamic descriptions following the description method given in Recommendation I.130. The application of the attribute technique and the definitions of these attributes and attribute values is given in Recommendation I.140. ÁHÁThe following set of bearer services categories is currently identified and more may be identified in the future. ÁHÁI.231.1ÂhøÂCircuit©mode 64 kbit/s unrestricted 8 kHz structured bearer service categoryÆÆ ÁHÁI.231.2ÂhøÂCircuit©mode 64 kbit/s 8 kHz structured bearer service category usable for speech information transferÆÆ ÁHÁI.231.3ÂhøÂCircuit©mode 64 kbit/s 8 kHz structured bearer service category usable for 3.1 kHz audio information transferÆÆ ÁHÁI.231.4ÂhøÂCircuit©mode alternate speech / 64 kbit/s unrestricted 8 kHz structured bearer service categoryÆÆ ÁHÁI.231.5ÂhøÂCircuit©mode 2 x 64 kbit/s unrestricted 8 kHz structured bearer service categoryÆÆ ÁHÁI.231.6ÂhøÂCircuit©mode 384 kbit/s unrestricted 8 kHz structured bearer service categoryÆÆ ÁHÁI.231.7ÂhøÂCircuit©mode 1536 kbit/s unrestricted 8 kHz structured bearer service categoryÆÆ ÁHÁI.231.8ÂhøÂCircuit©mode 1920 kbit/s unrestricted 8 kHz structured bearer service categoryÆÆ I.231.1 © ÃÃCircuit©mode 64 kbit/s unrestricted 8 kHz structured bearerÄÄ ÁHÁ ÃÃservice categoryÄÄ (Note 1) 1.ÁHÁÃÃDefinitionÄÄ ÁHÁThis bearer service category provides unrestricted information transfer between S/T reference points, it may, therefore, be used to support various user applications. Examples include: ÁHÁ1)Á   Áspeech (Note 2); ÁHÁ2)Á   Á3.1 kHz audio (Note 2); ÁHÁ3)Âh   Âmultiple subrate information streams multiplexed into 64 kbit/s by the user;ÆÆ ÁHÁ4)Âh   Âtransparent access to an X.25 public network (I.462 case a).ÆÆ ÁHÁUser information is transferred over a B channel, signalling is provided over a D channel. ÃÃNote 1ÄÄ © During an interim period some networks may only support restricted 64 kbit/s digital information transfer capability, i.e., information transfer capability solely restricted by the requirement that the all©zero octet is not allowed. For interworking the rules given in the Appendix of Recommendation I.520 should apply. The interworking functions have to be provided in the network with restricted 64 kbit/s capability. The ISDN with 64 kbit/s transfer capabilities will not be affected by this interworking other than by conveying the appropriate signalling message to and from the ISDN terminal. ÃÃNote 2ÄÄ © Whilst speech and 3.1 kHz audio have been given as applications for this bearer service category, it is recognized that it is the responsibility of the customers to ensure that a compatible encoding scheme is in operation. Customers should also recognize that no network provision can be made for the control of such items as echo and loss, as the network is unaware of the application in use. Furthermore, the quality of service attribute value for information transfer delay will indicate the suitability of a particular version of this bearer service for speech. 2.ÁHÁÃÃDescriptionÄÄ 2.1ÁHÁÃÃGeneral descriptionÄÄ ÁHÁThis circuit©mode bearer service category allows: ÁHÁ©Âà  Âtwo users (e.g. terminals, PABXs) in a point©to©point configuration to communicate via the ISDN using 64 kbit/s digital signals over the B channel, in both directions continuously and simultaneously for the duration of call;ÆÆ ÁHÁ©Âà  Âthree or more users in a multipoint configuration (refer to Recommendation I.254 for the supplementary service description on 3©party calling and conference calling).ÆÆ 2.2ÁHÁÃÃSpecific terminologyÄÄ ÁHÁRetention timer: This timer specifies the amount of time that the network retains the call information of the original call upon encountering busy or being released. This timer is a network provider option. The value for thisÔ _(Ô timer is greater than 15 seconds. 3. ÁHÁÃÃProceduresÄÄ 3.1ÁHÁÃÃProvision/withdrawalÄÄ 3.1.1ÁHÁProvision of this service will be by pre©arrangement with the administration/RPOA. 3.1.2ÁHÁThis bearer service is offered with several subscription options which apply separately to each ISDN number or group of ISDN numbers on the interface. For each subscription option, only one value can be selected. Subscription options for the interface are summarized below: ÁHÁÃÃSubscription optionÄÄ ÃÃValueÄÄ ÁHÁMaximum number of information © m, where m is not greater than ÁHÁchannels available at user B the number of information channels on the interface ÁHÁMaximum number of total calls © n, where n is not greater than ÁHÁpresent at user B the number of information channels on the interface ÁHÁUser B can be an ISDN number or group of ISDN numbers on the interface. ÃÃNoteÄÄ © More than one ISDN number can be associated with the service/interface only as a part of a supplementary service such as multiple subscriber number. Ð h ÐIn the case of one ISDN number, the option given above for the number of calls can only exceed the number of information channels in association with a supplementary service (e.g. call waiting). As a network provider option, separate values may be specified for incoming and for outgoing calls for either or both of the limits. 3.2ÁHÁÃÃNormal proceduresÄÄ ÁHÁAll user©network signalling is done on the D channel. ÁHÁa)Âh   ÂOriginating the service (call set©up)ÆÆ ÁHÁThe call is originated by the user requesting from the network the required bearer service with this request including a number identifying the called user. Other information, as required, for the bearer service and other information which may be required for use by the network in the supplementary service provided to the called user (e.g. calling line identity) may also be included. ÁHÁThis request may be given to the network either en bloc, containing all the required information, or not en bloc. ÁHÁb)Á   ÁIndications during call set©up ÁHÁAfter initiating a call the calling user will receive an acknowledgement that the network is able to process the call. The called user will receive an indication of the arrival of an incoming call of this bearer service. ÁHÁThe calling user shall also be given an indication that the incoming call is being offered to the called user, when an indication is received by the network that the called user is being informed of this call. When the call reaches the called user and the connection is established, an indication of this is sent to the calling user. ÁHÁThe called user may also provide other information, for use by the network in supplementary services provided to other users (e.g. connected line identity). The relationship of a connected user with the called user requires further study. ÁHÁOnce established, the B channel is then available for the transmission of 64 kbit/s digital signals in both directions continuously and simultaneously. Without alteration by the network. No restriction is placed by the network on the content of the digital signals (see Note 1). ÁHÁc)Á   ÁTerminating the call ÁHÁThe call may be terminated by either or both of the users by indicating this to the network. If one user terminates the call, an appropriate indication is sent to the other user. 3.3ÁHÁÃÃExceptional proceduresÄÄ ÁHÁa)Á   ÁFailure situations due to user error ÁHÁÁ  Ái)ÂhøÂA user inputting a network©identifiable, improper service request will be given an appropriate failure indication by the network and the call set©up will be ceased.ÆÆ ÁHÁÁ  Áii)ÂðøÂA user inputting a non©valid network number will be given an appropriate failure indication by the network and the call set©up will be ceased.ÆÆ ÁHÁb)Á   ÁFailure situations due to called user state ÁHÁÁ  Ái)ÂhøÂA calling user attempting to establish a call to a user who is identified by the network to be busy (either network© determined user busy or user©determined user busy) will be given an appropriate failure indication by the network.ÆÆ ÁHÁÁ  Áii)ÂðøÂA user attempting to establish a call to a user where terminal equipment fails to respond will be given an appropriate failure indication by the network and the call set©up will be ceased.ÆÆ ÁHÁÁ  Áiii)ÂxøÂOn a call to a user whose terminal equipment has responded that the called user is being informed of the call but has failed to answer within a defined period of time, the calling user attempting to establish the call will be given an appropriate failure indication by the network and the call set©up will be ceased.ÆÆ ÁHÁc)Á   ÁFailure situations due to network conditions ÁHÁÁ  Ái)ÂhøÂA user attempting to establish a call but meeting call failure situations due to network conditions               (e.g. congestion) will be given an appropriate failure indication by the network.ÆÆ ÁHÁd)Á   ÁFailure situations due to called user state and/or network ÁGÀ!HÁÁH8"IÁconditions ÁHÁÁ  Ái)ÂhøÂA user attempting to establish a call but meeting call failure situations due to network conditions (e.g. congestion) or called user state (e.g., busy) can have service data retained for a specified period of time, i.e., retention timer.Ô k+ÔÆÆŒ 3.4ÁHÁÃÃAlternative proceduresÄÄ 3.4.1ÁHÁÃÃReserved service proceduresÄÄ ÁHÁFor further study. 3.4.2ÁHÁÃÃPermanent service proceduresÄÄ ÁHÁFor further study. 4.ÁHÁÃÃNetwork capabilities for chargingÄÄ ÁHÁThis Recommendation does not cover charging principles. Future Recommendations in the D©Series are expected to contain that information. 4.1ÁHÁÃÃDemand service chargingÄÄ ÁHÁIt shall be possible to charge the subscriber accurately for the demand service. 4.2ÁHÁÃÃReserved service chargingÄÄ ÁHÁIt shall be possible to charge the subscriber accurately for the reserved service. 4.3ÁHÁÃÃPermanent service chargingÄÄ ÁHÁIt shall be possible to charge the subscriber accurately for the permanent service. 5.ÁHÁÃÃInterworking requirementsÄÄ ÁHÁInterworking between the ISDN and networks referred to as "digital PSTNs", pre ISDNs, pilot ISDNs or extended IDNs as well as between the ISDN and PSTNs may be required for this bearer service category. ÁHÁIn advance of the provision of the ISDN, similar services supported by 64 kbit/s connectivity will be available to customers by RPOAs/network operators on what may be described as "digital PSTNs", pre ISDNs, pilot ISDNs or extended IDNs. Interworking with ISDN customers will therefore be required. To effect this, as a broad guideline, RPOAs/network operators need to ensure these networks have the necessary functionality at the interworking point to provide service connectivity with the ISDN. ÁHÁA V©Series terminal connected to the ISDN via a terminal adaptor and using the 64 kbit/s unrestricted bearer service requires the use of an IWF (including a modem) in the network for calls to PSTN users. To effect the connection, a 64 kbit/s connection would need to be used to the IWF and a        3.1 kHz audio or equivalent connection would then need to be used to the PSTN user. 6.ÁHÁÃÃInteraction with supplementary servicesÄÄ ÁHÁNot applicable. Each supplementary service description identifies the applicability to this bearer service category. 7.ÁHÁÃÃAttributes and values of attributes (including the provision ofÄÄ ÁHÁÃÃindividual bearer services)ÄÄ 7.1ÁHÁÃÃAttributes and values of attributes of the circuit©modeÄÄ ÁHÁÃÃ64 kbit/s unrestricted 8 kHz structured bearer service categoryÄÄ ÁHÁÃÃAttributes/ValuesÄÄ ÁHÁÃÃInformation transfer attributesÄÄ ÁHÁ1)Âh   ÂInformation transfer mode : CircuitÆÆ ÁHÁ2)Âh   ÂInformation transfer rate : 64 kbit/sÆÆ ÁHÁ3)Âh   ÂInformation transfer capability : unrestrictedÆÆ ÁHÁ4)Âh   ÂStructure : 8 kHz integrityÆÆ ÁHÁ5)Âh   ÂEstablishment of communication : demand/reserved/permanentÆÆ ÁHÁ6)Âh   ÂSymmetry : bidirectional symmetric/ unidirectionalÆÆ ÁHÁ7)Âh   ÂCommunication configuration : point©to©point/multipointÆÆ ÁHÁÃÃAccess attributesÄÄ ÁHÁ8)Âh   ÂAccess channel : B for user informationÆÆ D for signalling (Note 1) ÁHÁ9)Âh   ÂAccess protocol : I©Series for D channelÆÆ ÃÃNote 1ÄÄ © For reserved/permanent service the operational administrative and maintenance messages (OAM) related to these services may be conveyed over the D channel. ÁHÁÃÃGeneral attributesÄÄ ÁHÁ10)Âð   ÂSupplementary services provided refer to I.250ÆÆ ÁHÁ11)Âð   ÂQuality of service À$ÀÆÆ À$À ÁHÁ12)Âð   ÂInterworking possibilities À$À for further studyÆÆ À$À ÁHÁ13)Âð   ÂOperational and commercial aspects À$ÀÆÆ 7.2ÁHÁÃÃProvision of individual bearer servicesÄÄ ÁHÁIn the following table the provision of individual circuit©mode 64 kbit/s unrestricted 8 kHz structured bearer services is given. The definition of E (essential) and A (additional) can be found in Recommendation I.230. ÁHÁa)Á   Áoverall provision: E ÁHÁb)Á   Ávariations of secondary attributes Áà81Áestablishment symmetry communication provisionƒ Áà88Áof communication configuration             ƒ Áà8RÁƒ Áà82ÁI.231.1/1 demand À$À pt©pt E    ƒ Áà82ÁI.231.1/2 reserved À$À bidirectional pt©pt A    ƒ Áà82ÁI.231.1/3 permanent À$À pt©pt E    ƒÔ k+ÔŒÁà8RÁƒ Áà82ÁI.231.1/4 demand À$À pt©pt A    ƒ Áà82ÁI.231.1/5 reserved À$À unidirectional pt©pt A    ƒ Áà82ÁI.231.1/6 permanent À$À pt©pt A    ƒ Áà8RÁƒ Áà82ÁI.231.1/7 demand À$À multipt A    ƒ Áà82ÁI.231.1/8 reserved À$À bidirectional multipt A    ƒ Áà82ÁI.231.1/9 permanent À$À multipt A    ƒ Áà8RÁƒ Áà82ÁI.231.1/10 demand À$À multipt A    ƒ Áà82ÁI.231.1/11 reserved À$À unidirectional multipt A    ƒ Áà82ÁI.231.1/12 permanent À$À multipt A    ƒ ÁHÁc)Á   Áaccess ÁHÁsignalling & OAM user information (Note 2) Áà8AÁchannel channel                              ƒ Áà84Á& rate protocols & rate protocols provision   ƒ Áà82ÁÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀ ƒ Áà8RÁƒ Áà86ÁD(16) I.451 (Note 1) B(64) user©defined E      ƒ Áà86ÁD(64) I.451 (Note 1) B(64) user©defined E      ƒ ÃÃNote 1ÄÄ © Demand services only FS for reserved and permanent services. ÃÃNote 2ÄÄ © Definition of protocols for OAM is for further study. 8.ÁHÁÃÃDynamic descriptionÄÄ ÁHÁThe dynamic description for this service on a demand basis is identical for a number of circuit©mode services and is therefore collectively given in Recommentation I.220. I.231.2 © ÃÃCircuit©mode 64 kbit/s 8 kHz structured bearer service categoryÄÄ ÁHÁ ÃÃusable for speech information transferÄÄ 1.ÁHÁÃÃDefinitionÄÄ ÁHÁThis bearer service category is intended to support speech. ÁHÁThe digital signal at the S/T reference point shall conform to Recommendation G.711 (A©law or ÀÀ©law). The network may use processing techniques appropriate for speech such as analogue transmission, echo cancellation and low bit rate voice encoding. Hence, bit integrity is not assured. This bearer service is not intended to support modem derived voice band data. ÁHÁAll CCITT Recommendations for the transfer of speech information in the network apply to this service. 2.ÁHÁÃÃDescriptionÄÄ 2.1ÁHÁÃÃGeneral descriptionÄÄ ÁHÁThis circuit©mode bearer service category allows: ÁHÁ©Âà  Âtwo users (e.g. terminals, PABXs) in a point©to©point configuration to communicate via the ISDN using speech encoding into 64 kbit/s digital signals over the B channel, in both directions continuously and simultaneously for the duration of a call;ÆÆ ÁHÁ©Âà  Âthree or more users in a multipoint configuration (refer to Recommendation I.254 for the supplementary service description for 3©party calling and conference calling).ÆÆ ÁHÁÂX  ÂTones and/or announcements to indicate the progress or otherwise of a call, are provided by the network.ÆÆ 2.2ÁHÁÃÃSpecific terminologyÄÄ ÁHÁRetention timer: This timer specifies the amount of time that the network retains the call information of the original call upon encountering busy or being released. This timer is a network provider option. The value for this timer is greater than 15 seconds. 3. ÁHÁÃÃProceduresÄÄ 3.1ÁHÁÃÃProvision/withdrawalÄÄ 3.1.1ÁHÁProvision of this service will be by pre©arrangement with the administration/RPOA. 3.1.2ÁHÁThis bearer service is offered with several subscription options which apply separately to each ISDN number or group of ISDN numbers on the interface. For each subscription option, only one value can be selected. Subscription options for the interface are summarized below: ÁHÁÃÃSubscription optionÄÄ ÃÃValueÄÄ ÁHÁMaximum number of information © m, where m is not greater than ÁHÁchannels available at user B the number of information channels on the interface ÁHÁMaximum number of total calls © n, where n is not greater than ÁHÁpresent at user B the number of information channels on the interface ÁHÁUser B can be an ISDN number or group of ISDN numbers on the interface. ÃÃNoteÄÄ © More than one ISDN number can be associated with the service/interface only as a part of a supplementary service such as multiple subscriber number. In the case of one ISDN number, the option given above for the number of calls can only exceed the number of information channels in association with a supplementary service (e.g. call waiting). As a network provider option, separate values may be specified for incoming and for outgoing calls for either or both of the limits. 3.2ÁHÁÃÃNormal proceduresÄÄ ÁHÁOut©of©band messages shall always be provided to indicate call progress, etc. However, network©generated in©band tones and announcements shall always be provided for this bearer service. ÁHÁa)Âh   ÂOriginating the service (call set©up)ÆÆ ÁHÁThe call is originated by the user requesting the required bearer service with this request including a number identifying the called user. Other information,Ô k+Ô as required and other information which may be required for use by the network in the supplementary service provided to the called user (e.g. calling line identity) may also be included. ÁHÁThis request may be given to the network either en bloc, containing all the required information, or not en bloc. ÁHÁb)Á   ÁIndications during call set©up ÁHÁAll indications entail signalling messages and shall include, where appropriate, in©band tones or announcements. ÁHÁAfter initiating a call the calling user will receive an acknowledgement that the network is able to process the call. The called user will receive an indication of the arrival of an incoming call of this bearer service. ÁHÁThe calling user shall also be given an indication that the incoming call is being offered to the called user. When an indication is received by the network that the called user is being informed of this call. When the call reaches the called user and the connection is established, an indication of this is sent to the calling user. ÁHÁThe called user may also provide other information, for use by the network in supplementary services provided to other users (e.g. connected line identity). The relationship of a connected user with a called user requires further study. ÁHÁOnce established, the B channel is then available for the transmission of speech signals in both directions continuously and simultaneously. ÁHÁc)Á   ÁTerminating the call ÁHÁThe call may be terminated by either or both of the users by indicating this to the network. If one user terminates the call, an appropriate indication is sent to the other user. 3.3ÁHÁÃÃExceptional proceduresÄÄ ÁHÁa)Á   ÁFailure situations due to user error ÁHÁÁ  Ái)ÂhøÂA user inputting a network©identifiable, improper service request will be given an appropriate failure indication by the network and the call set©up will be ceased;ÆÆ ÁHÁ Á  Áii)ÂðøÂA user inputting a non©valid network number will be given an appropriate failure indication by the network and the call set©up will be ceased.ÆÆ ÁHÁb)Á   ÁFailure situations due to called user state ÁHÁÁ  Ái)ÂhøÂA calling user attempting to establish a call to a user who is identified by the network to be busy (either network© determined user busy or user©determined user busy) will be given an appropriate failure indication by the network;ÆÆ ÁHÁÁ  Áii)ÂðøÂA user attempting to establish a call to a user whose terminal equipment fails to respond will be given an appropriate failure indication by the network and the call set©up will be ceased;ÆÆ ÁHÁÁ  Áiii)ÂxøÂOn a call to a user whose terminal equipment has responded that the called user is being informed of the call but has failed to answer within a defined period of time, the calling user attempting to establish the call will be given an appropriate failure indication by the network and the call set up will be ceased.ÆÆ ÁHÁc)Á   ÁFailure situations due to network conditions ÁHÁÁ  Ái)ÂhøÂA user attempting to establish a call but meeting call failure situations due to network conditions (e.g., congestion) will be given an appropriate failure indication by the network.ÆÆ ÁHÁd)Âh   ÂFailure situations due to called user state and/or network conditionsÆÆ ÁHÁÁ  Ái)ÂhøÂA user attempting to establish a call but meeting call failure situations due to network conditions (e.g. congestion) or called user state (e.g., busy) can have service data retained for a specified period of time, i.e., retention timer.ÆÆ 3.4ÁHÁÃÃAlternative proceduresÄÄ 3.4.1ÁHÁÃÃReserved service proceduresÄÄ ÁHÁFor further study. 3.4.2ÁHÁÃÃPermanent service proceduresÄÄ ÁHÁFor further study. 4.ÁHÁÃÃNetwork capabilities for chargingÄÄ ÁHÁThis Recommendation does not cover charging principles. Future Recommendations in the D©Series are expected to contain that information. 4.1ÁHÁÃÃDemand service chargingÄÄ ÁHÁIt shall be possible to charge the subscriber accurately for the demand service. 4.2ÁHÁÃÃReserved service chargingÄÄ ÁHÁIt shall be possible to charge the subscriber accurately for the reserved service. 4.3ÁHÁÃÃPermanent service chargingÄÄ ÁHÁIt shall be possible to charge the subscriber accurately for the permanent service. 5.ÁHÁÃÃInterworking considerationsÄÄ ÁHÁInterworking is required between the ISDN and the PSTN for this bearer service category. 6.ÁHÁÃÃInteraction with supplementary servicesÄÄ ÁHÁNot applicable. Each supplementary service description indentifies the applicability with this bearer service category. Ô k+ÔŒ7.ÁHÁÃÃAttributes and values of attributes (including the provision ofÄÄ ÁHÁÃÃindividual bearer services)ÄÄ 7.1ÂàHÂÃÃAttributes and values of attributes of the circuit©mode 64 kbit/s 8 kHzÄÄ ÃÃstructured bearer service category usable for speech informationÄÄ ÃÃtransferÄÄÆÆ ÁHÁÃÃInformation transfer attributesÄÄ ÁHÁ1) Information transfer mode : Circuit ÁHÁ2) Information transfer rate : 64 kbit/s ÁHÁ3) Information transfer capability : Speech (encoded) ÁHÁ according to G.711 A©law ÀÀ©law) (Note 1) ÁHÁ4) Structure : 8 kHz integrity ÁHÁ5) Establishment of communication : demand/reserved/permanent ÁHÁ6) Symmetry : bidirectional symmetric/ unidirectional ÁHÁ7) Communication configuration : point©to©point/multipoint ÁHÁÃÃAccess attributesÄÄ ÁHÁ8) Access channel : B for user information D for signalling (Note 2) ÁHÁ9) Access protocol : I©Series for D©channel, ÁHÁ G.711 for B©channel ÁHÁÃÃGeneral attributesÄÄ ÁHÁ10) Supplementary services provided refer to I.250 ÁHÁ11) Quality of service À$À for further study À$À (may be different from ÁHÁ12) Interworking possibilities À$À I.231A) À$À ÁHÁ13) Operation and commercial aspects À$À ÃÃNote 1ÄÄ © When crossing an international boundary between administrations which employ different encoding laws the network shall perform the necessary A©ÀÀ law conversion (see Recommendation G.711). ÃÃNote 2ÄÄ © For reserved/permanent service the operational administrative and maintenance messages (OAM) related to these services may be conveyed over the D channel. 7.2ÁHÁÃÃProvision of individual bearer servicesÄÄ ÁHÁIn the following table the provision of individual circuit©mode 64 kbit/s 8 kHz structured bearer services usable for speech information transfer is given. The definition of E (essential) and A (additional) can be found in Recommendation I.230. ÁHÁa)Á   Áoverall provision: E ÁHÁb)Á   Ávariations of secondary attributes Áà81Áestablishment symmetry communication provisionƒ Áà88Áof communication configuration             ƒ Áà8RÁƒ Áà82ÁI.231.2/1 demand À$À pt©pt E    ƒ Áà82ÁI.231.2/2 reserved À$À bidirectional pt©pt A    ƒ Áà82ÁI.231.2/3 permanent À$À pt©pt E    ƒ Áà8RÁƒ Áà82ÁI.231.2/4 demand À$À pt©pt A    ƒ Áà82ÁI.231.2/5 reserved À$À unidirectional pt©pt A    ƒ Áà82ÁI.231.2/6 permanent À$À pt©pt A    ƒ Áà8RÁƒ Áà82ÁI.231.2/7 demand À$À multipt A    ƒ Áà82ÁI.231.2/8 reserved À$À bidirectional multipt A    ƒ Áà82ÁI.231.2/9 permanent À$À multipt A    ƒ Áà8RÁƒ Áà82ÁI.231.2/10 demand À$À multipt A    ƒ Áà82ÁI.231.2/11 reserved À$À unidirectional multipt A    ƒ Áà82ÁI.231.2/12 permanent À$À multipt A    ƒ ÁHÁc)Á   Áaccess ÁHÁsignalling & OAM user information (Note 2) Áà8AÁchannel channel                              ƒ Áà84Á& rate protocols & rate protocols provision   ƒ Áà82ÁÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀ ƒ Áà8RÁƒ Áà87ÁD(16) I.451 (Note 1) B(64) G.711    E      ƒ Áà89ÁD(64) I.451 (Note 1) B(64)     G.711    E      ƒ Áà8RÁƒ ÃÃNote 1ÄÄ © Some networks will offer this service in a manner identical to the 3.1 kHz audio service. ÃÃNote 2ÄÄ © Definition of protocols for OAM is for further study. ÃÃNote 3ÄÄ © Demand service only. FS for reserved and permanent services. 8.ÁHÁÃÃDynamic descriptionÄÄ ÁHÁThe dynamic description for this service on a demand basis is identical for a number of circuit mode services and is therefore collectively given in Recommentation I.220. I.231.3 © ÃÃCircuit©mode 64 kbit/s 8 kHz structured bearer service category usableÄÄ           ÃÃfor 3.1 kHz audio information transferÄÄ 1.ÁHÁÃÃDefinitionÄÄ ÁHÁThis bearer service category corresponds to the service which is currently offered in the PSTN. This bearer service category provides for the transfer of speech and of 3.1 kHz bandwidth audio information such as voice band data via modems facsimile group 1, 2 and 3 information (Note 1). The digital signal at the S/T reference point shall conform to Recommendation G.711 (A©law or ÀÀ©law). ÁHÁConnections provided for these services should offer the transferÔ k+Ô capability for the information indicated above. (This means that the network may include speech processing techniques provided they are appropriately modified or functionally removed prior to non©speech information transfer). The control of echo control devices, speech processing devices etc., is only made by use of disabling tones (see Recommendation V.25). Bit integrity is not assured. The network may use analogue transmission. ÁHÁAll CCITT Recommendations for the transfer of speech information in the network apply to this bearer service category. ÃÃNote 1ÄÄ © The maximum modem bit rate that can be used by users in applications of this bearer service category depends on the modulation standard employed by the user and on the transmission performance within or between different administrations. The extent of support is a network or bilaterally agreed matter. 2.ÁHÁÃÃDescriptionÄÄ 2.1ÁHÁÃÃGeneral descriptionÄÄ ÁHÁThis circuit©mode bearer service category allows: ÁHÁ©Âà  Âtwo users (e.g. terminals, PABXs) in a point©to©point configuration to communicate via the ISDN using 3.1 kHz audio information encoding into 64 kbit/s digital signals over the B channel, in both directions continuously and simultaneously for the duration of a call;ÆÆ ÁHÁ©Âà  Âthree or more users in a multipoint©configuration (refer to Recommendation I.254 for the supplementary service descriptions on 3©way calling and conference calling).ÆÆ ÁHÁTones and/or announcements to indicate the progress or otherwise of a call, are provided by the network. 2.2ÁHÁÃÃSpecific terminologyÄÄ ÁHÁRetention timer: This timer specifies the amount of time that the network retains the call information of the original call upon encountering busy or being released. This timer is a network provider option. The value for this timer is greater than 15 seconds. 3. ÁHÁÃÃProceduresÄÄ 3.1ÁHÁÃÃProvision/withdrawalÄÄ 3.1.1ÁHÁProvision of this service will be by pre©arrangement with the administration/RPOA. 3.1.2ÁHÁThis bearer service is offered with several subscription options which apply separately to each ISDN number or group of ISDN numbers on the interface. For each subscription option, only one value can be selected. Subscription options for the interface are summarized below: ÁHÁÃÃSubscription optionÄÄ ÃÃValueÄÄ ÁHÁMaximum number of information © m, where m is not greater than ÁHÁchannels available at user B the number of information channels on the interface ÁHÁMaximum number of total calls © n, where n is not greater than ÁHÁpresent at user B the number of information channels on the interface ÁHÁUser B can be an ISDN number or group of ISDN numbers on the interface. ÃÃNoteÄÄ © More than on ISDN number can be associated with the service/interface only as a part of a supplementary service such as multiple subscriber number. In the case of one ISDN number, the option given above for the number of calls can only exceed the number of information channels in association with a supplementary service (e.g. call waiting). As a network provider option, separate values may be specified for incoming and for outgoing calls for either or both of the limits. 3.2ÁHÁÃÃNormal proceduresÄÄ ÁHÁOut©of©band messages shall always be provided to indicate call progress, etc. However, network©generated in©band tones and announcements shall always be provided for this bearer service. ÁHÁa) Originating the service (call set©up) ÁHÁThe call is originated by the user requesting the required bearer service with this request including a number identifying the called user. Other information, as required and other information which may be required for use by the network is supplementary services provided to the user (e.g. calling line identity) may also be included. ÁHÁThis request may be given to the network either en bloc, containing all the required information, or not en bloc. ÁHÁb)Á   ÁIndications during call set©up ÁHÁAll indications entail signalling messages and may also include in©band tones or announcements. ÁHÁAfter initiating a call the calling user will receive an acknowledgement that the network is able to process the call. The called user will receive an indication of the arrival of an incoming call of this bearer service. ÁHÁThe calling user shall also be given an indication that the incoming call is being offered to the called user. When an indication is received by the network that the called user is being informed of this call. When the call reaches the called user and the connection is established, an indication of this is sent to the calling user. ÁHÁThe called user may also provide other information, for use by the network in supplementary services provided to other users (e.g., connected line identity). The relationship of a connected user with a called user requires further study. ÁHÁOnce established, the B channel is then available for the transmission of the requested (i.e., speech or 3.1 kHz audio information) signals in both directions continuously and simultaneously. Refer to the relevant D©Series Recommendations for charging aspects. ÁHÁc)Á   ÁTerminating the call ÁHÁThe call may be terminated by either or both of the users by indicating this to the network. If one user terminates the call, an appropriate indication is sent to the other user.Ô k+ÔŒ 3.3ÁHÁÃÃExceptional proceduresÄÄ ÁHÁa)Á   ÁFailure situations due to user error ÁHÁÁ  Ái)ÂhøÂA user inputting a network©identifiable, improper service request will be given an appropriate failure indication by the network and the call set©up will be ceased.ÆÆ ÁHÁ Á  Áii)ÂðøÂA user inputting a non©valid network number will be given an appropriate failure indication by the network and the call set©up will be ceased.ÆÆ ÁHÁb)Á   ÁFailure situations due to called user state ÁHÁÁ  Ái)ÂhøÂA calling user attempting to establish a call to a user who is identified by the network to be busy (either network© determined user busy or user©determined user busy) will be given an appropriate failure indication by the network.ÆÆ ÁHÁÁ  Áii)ÂðøÂA user attempting to establish a call to a user whose terminal equipment fails to respond will be given an appropriate failure indication by the network and the call set©up will be ceased.ÆÆ ÁHÁÁ  Áiii)ÂxøÂOn a call to a user whose terminal equipment has responded that the called user is being informed of the call but has failed to answer within a defined period of time, the calling user attempting to establish the call will be given an appropriate failure indication by the network and the call set up will be ceased.ÆÆ ÁHÁc)Á   ÁFailure situations due to network conditions ÁHÁÁ  Ái)ÂhøÂA user attempting to establish a call but meeting call failure situations due to network conditions (e.g., congestion) will be given an appropriate failure indication by the network.ÆÆ ÁHÁd)Á   ÁFailure situations due to called user state and/or network                conditions ÁHÁÁ  Ái)ÂhøÂA user attempting to establish a call but meeting call failure situations due to network conditions (e.g., congestion) or called user state (e.g., busy) can have service data retained for a specified period of time, i.e., retention timer.ÆÆ 3.4ÁHÁÃÃAlternative proceduresÄÄ 3.4.1ÁHÁÃÃReserved service proceduresÄÄ ÁHÁFor further study. 3.4.2ÁHÁÃÃPermanent service proceduresÄÄ ÁHÁFor further study. 4.ÁHÁÃÃNetwork capabilities for chargingÄÄ ÁHÁThis Recommendation does not cover charging principles. Future Recommendations in the D©Series are expected to contain that information. 4.1ÁHÁÃÃDemand service chargingÄÄ ÁHÁIt shall be possible to charge the subscriber accurately for the demand service. 4.2ÁHÁÃÃReserved service chargingÄÄ ÁHÁIt shall be possible to charge the subscriber accurately for the reserved service. 4.3ÁHÁÃÃPermanent service chargingÄÄ ÁHÁIt shall be possible to charge the subscriber accurately for the permanent service. 5.ÁHÁÃÃInterworking requirementsÄÄ ÁHÁInterworking is required between the ISDN and the PSTN for this bearer service category. 6.ÁHÁÃÃInteraction with supplementary servicesÄÄ ÁHÁNot applicable. Each supplementary service description identifies the applicability to this bearer service category. 7.ÁHÁÃÃAttributes and values of attributes (including the provision ofÄÄ ÁHÁÃÃindividual bearer services)ÄÄ 7.1ÂàHÂÃÃAttributes and values of attributes of the circuit©mode 64 kbit/sÄÄ ÃÃ8 kHz structured bearer service category usable for 3.1 kHz audioÄÄ ÃÃinformation transferÄÄÆÆ ÁHÁÃÃInformation transfer attributesÄÄ ÁHÁ1) Information transfer mode : Circuit ÁHÁ2) Information transfer rate : 64 kbit/s ÁHÁ3) Information transfer capability : 3.1 kHz audio (Note 1) ÁHÁ4) Structure : 8 kHz integrity ÁHÁ5) Establishment of communication : demand/reserved/permanent ÁHÁ6) Symmetry : bidirectional symmetric/ unidirectional ÁHÁ7) Communication configuration : point©to©point/multipoint ÁHÁÃÃAccess attributesÄÄ ÁHÁ8) Access channel : B for user information D for signalling and/or operational administrative and maintenance (OAM) messages ÁHÁ9) Access protocol : G.711 for B channel, I©Series ÁHÁ for D channelÔ k+ÔŒ ÁHÁÃÃGeneral attributesÄÄ ÁHÁ10) Supplementary services provided refer to I.250 ÁHÁ11) Quality of service À$À                   À$À Á1p2Á12) Interworking possibilities À$À for further study À$À Á1p2Á13) Operation and commercial aspects À$À ÃÃNote 1ÄÄ © When crossing an international boundary between administrations which employ different encoding laws the network shall perform the necessary A©ÀÀ law conversion (see Recommendation G.711). 7.2ÁHÁÃÃProvision of individual bearer servicesÄÄ ÁHÁIn the following table the provision of individual circuit©mode 64 kbit/s 8 kHz structured bearer services usable for 3.1 kHz audio information transfer is given. The definition of E (essential) and A (additional) can be found in Recommendation I.230. ÁHÁa)Á   Áoverall provision: E ÁHÁb)Á   Ávariations of secondary attributes Áà81Áestablishment symmetry communication provisionƒ Áà88Áof communication configuration             ƒ Áà8RÁƒ Áà82ÁI.231.3/1 demand À$À pt©pt E    ƒ Áà82ÁI.231.3/2 reserved À$À bidirectional pt©pt A    ƒ Áà82ÁI.231.3/3 permanent À$À pt©pt E    ƒ Áà8RÁƒ Áà82ÁI.231.3/4 demand À$À pt©pt A    ƒ Áà82ÁI.231.3/5 reserved À$À unidirectional pt©pt A    ƒ Áà82ÁI.231.3/6 permanent À$À pt©pt A    ƒ Áà8RÁƒ Áà82ÁI.231.3/7 demand À$À multipt A    ƒ Áà82ÁI.231.3/8 reserved À$À bidirectional multipt A    ƒ Áà82ÁI.231.3/9 permanent À$À multipt A    ƒ Áà8RÁƒ Áà82ÁI.231.3/10 demand À$À multipt A    ƒ Áà82ÁI.231.3/11 reserved À$À unidirectional multipt A    ƒ Áà82ÁI.231.3/12 permanent À$À multipt A    ƒ Áà8RÁƒ ÁHÁc)Á   Áaccess ÁHÁsignalling & OAM user information (Note 1) Áà8AÁchannel channel                              ƒ Áà84Á& rate protocols & rate protocols provision   ƒ Áà82ÁÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀ ƒ Áà8RÁƒ Áà87ÁD(16) I.451 (Note 2) B(64) G.711    E      ƒ Áà89ÁD(64) I.451 (Note 2) B(64)     G.711    E      ƒ ÃÃNote 1ÄÄ © Definition of protocols for OAM is for further study. ÃÃNote 2ÄÄ © Demand services only. FS for reserved and permanent services. 8.ÁHÁÃÃDynamic descriptionÄÄ ÁHÁThe dynamic description for this service on a demand basis is identical for a number of circuit mode services and is therefore collectively given in Recommendation I.220. I.231.4 © ÃÃCircuit©mode alternate speech / 64 kbit/s unrestricted 8 kHzÄÄ           ÃÃstructured bearer service categoryÄÄ 1.ÁHÁÃÃDefinitionÄÄ ÁHÁThis bearer service category provides the alternate transfer at either speech of 64 kbit/s unrestricted digital information with the same call. ÁHÁThe request for this alternate capability and the initial mode desired by the user must be identified at call set©up time. ÁHÁThis service is provided for the support of multiple capability terminals or single capability terminals. ÁHÁFor the speech mode of this bearer service category the same applies as for the speech bearer service category. For the unrestricted mode of this bearer service category the same applies as for the unrestricted (Note 1) bearer service category. ÃÃNote 1ÄÄ © During an interim period some networks may only support restricted 64 kbit/s digital information transfer capability, i.e., information transfer capability solely restricted by the requirement that the all©zero octet is not allowed. For interworking the rules given in the appendix of Recommendation I.520 should apply. The interworking functions have to be provided in the network with restricted capability. The ISDN with 64 kbit/s transfer capabilities will not be affected by this interworking, other than by conveying the appropriate signalling message to or from the ISDN terminal. ÃÃNote 2ÄÄ © Initially, this service will only be applicable to multiple capability terminals. The use of this service by, and the network support of single capability terminals is for further study, (e.g., how does a user change terminals). All references to single capability terminals reflect possible future enhancements and are subject to change and have only been included for information. 2.ÁHÁÃÃDescriptionÄÄ 2.1ÁHÁÃÃGeneral descriptionÄÄ ÁHÁOnce the connection is established, the user may repeatedly request via appropriate signalling messages, to alternate from speech mode to 64 kbit/s unrestricted digital mode, or vice versa. The in©call modification shall be provided on a per call basis. 2.2ÁHÁÃÃSpecific terminologyÄÄ ÁHÁNone identified. 2.3ÁHÁÃÃQualifications on the applicability to telecommunications servicesÄÄ ÁHÁNone identified.Ô k+ ÔŒ 3.ÁHÁÃÃProceduresÄÄ 3.1ÁHÁÃÃProvision/withdrawalÄÄ ÁHÁThis service shall be provided by pre©arrangement with the service provider. 3.2ÁHÁÃÃNormal proceduresÄÄ 3.2.1ÁHÁÃÃActivation/deactivation/registrationÄÄ ÁHÁNot applicable. 3.2.2ÁHÁÃÃInvocation and operationÄÄ ÁHÁAt the start of the call the request for an alternate speech/64 kbit unrestricted call and the initial mode either speech or 64 kbit unrestricted call must be identified. Following call set©up, the calling or called party may choose to modify the characteristics of the call during the conversation/data phase. During call establishment, the network shall choose a suitable route according to the information included in the set©up message. ÁHÁDepending on the terminal capability type the following procedures will apply: ÁHÁa)Âh   ÂFor multiple capability terminals the requesting user will send an invoke in©call modification request to the network.ÆÆ ÁHÁb)Âh   ÂFor single capability terminals the requesting user will charge over the correction from the first terminal to the second terminal before sending an invoke in©call modification request to the network.ÆÆ ÁHÁThe network will, on receipt of the in©call modification request from the calling/called party, check if that call modification is allowed and if the necessary resources are available. ÁHÁIf acceptable, the resources are reserved and an invoke in©call modification request is sent to the distant end. A timer will be started to supervise that the in©call modification is received successfully. ÁHÁDepending on the terminal configuration at the destination end the following procedures will occur: ÁHÁa)Âh   ÂFor multiple capability terminals the distant user, if agreeing with the service change©over, will transmit a return result indication while the resources in the network are switched in if reserved and the call modification indication is sent to the initiating party.ÆÆ ÁHÁb)Âh   ÂFor single capability terminals a call charge over will be performed from the first terminal to the second terminal. An in© call modification return result will be sent to the network which will switch in the resources if reserved previously.ÆÆ 3.3ÁHÁÃÃExceptional proceduresÄÄ 3.3.1ÁHÁÃÃActivation/deactivation/registrationÄÄ ÁHÁNot applicable. 3.3.2ÁHÁÃÃInvocation and operationÄÄ ÁHÁIf the network fails to change resources on receipt of the in©call modification return result, the connection will be cleared with a cause indication "temporary failure". ÁHÁIf on receipt of a call modification invocation request an exchange determines that in©call modification is not allowed or not possible a call modification return error indication will be sent. Receipt of the call modification return error indication will cause the reserved resources to be freed and a call modification return error indication to be delivered to the initiating party. ÁHÁIn case of in©call modification failure, the initiating terminal after having received the in©call modification return error indication will resume to transmit and receive the bit stream for the old service. 3.4ÁHÁÃÃAlternative proceduresÄÄ ÁHÁNone identified. 4.ÁHÁÃÃNetwork capabilities for chargingÄÄ ÁHÁThis Recommendation does not cover charging principles. Future Recommendations in the D©Series are expected to contain that information. ÁHÁIt shall be possible to charge the subscriber accurately for the service. 5.ÁHÁÃÃInterworking requirementsÄÄ ÁHÁFor further study. 6.ÁHÁÃÃInteractions with supplementary servicesÄÄ ÁHÁFor further study. 7.ÂXHÂÃÃAttributes and values of attributes (including the provision ofÄÄ ÃÃindividual bearer services)ÄÄÆÆ 7.1ÂàHÂÃÃAttributes and values of attributes of the circuit©mode alternateÄÄ ÃÃspeech 64 kbit/s unrestricted 8 kHz structured bearer service categoryÄÄ ÁDX EÁÃÃAttributes/ValuesÄÄÆÆ ÁHÁÃÃInformation transfer attributesÄÄ ÁHÁ1) Information transfer mode : Circuit ÁHÁ2) Information transfer rate : 64 kbit/s ÁHÁ3) Information transfer capability : Alternately speech (Note 1) or unrestricted digital Á@xAÁÁAðBÁÁBhCÁ information ÁHÁ4) Structure : 8 kHz integrity ÁHÁ5) Establishment of communication : demand/reserved/permanent ÁHÁ6) Symmetry : bidirectional symmetric/ Ô k+ Ô unidirectional ÁHÁ7) Communication configuration : point©to©point/multipoint ÁHÁÃÃAccess attributesÄÄ ÁHÁ8) Access channel : B for user information D for signalling (see Note 2) ÁHÁ9) Access protocol : I©Series for D channel ÁHÁÃÃGeneral attributesÄÄ ÁHÁ10) Supplementary services provided À$À À$À ÁHÁ11) Quality of service (see Note 3) À$À À$À for further study ÁHÁ12) Interworking possibilities À$À À$À ÁHÁ13) Operation and commercial aspects À$À ÃÃNote 1ÄÄ © When crossing an international boundary between administrations which employ different encoding laws the network shall perform the necessary A©ÀÀ law conversion (see Recommendation G.711). ÃÃNote 2ÄÄ © For reserved/permanent service the operational administrative and maintenance messages (OAM) related to these services may be conveyed over the D channel. ÃÃNote 3ÄÄ © A short service change over time (with a high probability of not being exceeded) has been tentatively identified as a requirements. 7.2ÁHÁÃÃProvision of individual bearer servicesÄÄ ÁHÁIn the following table the provision of individual circuit mode alternate speech/64 kbit/s unrestricted 8 kHz structured bearer services is given. The definition of E (essential) and A (additional) can be found in Recommendation I.230. ÁHÁa)Á   Áoverall provision: A (Note 1) ÁHÁb)Á   Ávariations of secondary attributes Áà81Áestablishment symmetry communication provisionƒ Áà88Áof communication configuration             ƒ Áà8RÁƒ Áà82ÁI.231.4/1 demand ) pt©pt E    ƒ Áà8:ÁI.231.4/2 reserved )                 pt©pt A    ƒ Áà82ÁI.231.4/3 permanent ) bidirectional pt©pt E    ƒ Áà82ÁI.231.4/4 demand ) multipt A    ƒ Áà89ÁI.231.4/5 reserved )                multipt A    ƒ Áà82ÁI.231.4/6 permanent ) multipt A    ƒ ÁHÁc)Á   Áaccess ÁHÁsignalling & OAM user information (Note 2) Áà8AÁchannel channel                              ƒ Áà84Á& rate protocols & rate protocols provision   ƒ Áà82ÁÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀ ƒ Áà8RÁƒ Áà85ÁD(16) I.451 (Note 3) B(64) G.711/user E       ƒ Áà8GÁdefined ƒ Áà87ÁD(64) I.451 (Note 3) B(64)     G.711/user E       ƒ defined ÃÃNote 1ÄÄ © Some networks will offer the speech phase of these services in a manner identical to the 3.1 kHz audio service. ÃÃNote 2ÄÄ © Definition of protocols for OAM is for further study. ÃÃNote 3ÄÄ © Demand service only FS for reserved and permanent services. The         protocols for initiating the changeover between speech and unrestricted digital information and synchronizing this changeover are for further study. 8.ÁHÁÃÃDynamic descriptionÄÄ ÁHÁThe dynamic description for this service needs further study and is not yet available. I.231.5 © ÃÃCircuit©mode 2 x 64 kbit/s unrestricted 8 kHz structured bearerÄÄ           ÃÃservice categoryÄÄ 1.ÁHÁÃÃDefinitionÄÄ ÁHÁThis bearer service category provides the unrestricted transfer of two 64 kbit/s user information flows over two B channels at the user network interface. 2.ÁHÁÃÃDescriptionÄÄ ÁHÁFor further study. 3.ÁHÁÃÃProceduresÄÄ ÁHÁFor further study. 4.ÁHÁÃÃNetwork capabilities for chargingÄÄ ÁHÁThis Recommendation does not cover charging principles. Future Recommendations in the D©Series are expected to contain that information. ÁHÁIt shall be possible to charge the subscriber accurately for the service. 5.ÁHÁÃÃInterworking requirementsÄÄ ÁHÁFor further study. 6.ÁHÁÃÃInteraction with supplementary servicesÄÄ ÁHÁFor further study. 7.ÂXHÂÃÃAttributes and values of attributes (including the provision ofÄÄ ÃÃindividual bearer services)ÄÄÆÆ 7.1ÂàHÂÃÃAttributes and values of attributes of the circuit mode 2 x 64 kbit/sÄÄ ÃÃunrestricted 8 kHz structured bearer service categoryÄÄÆÆ ÁHÁÃÃInformation transfer attributesÄÄÔ k+ ÔŒ ÁHÁ1) Information transfer mode : Circuit ÁHÁ2) Information transfer rate : 2 x 64 kbit/s ÁHÁ3) Information transfer capability : unrestricted (Note 1) ÁHÁ4) Structure : 8 kHz integrity with restricted differential time delay (RDTD) ÁHÁ5) Establishment of communication : demand/reserved/permanent ÁHÁ6) Symmetry : bidirectional symmetric/ bidirectional©asymmetric                                                  unidirectional ÁHÁ7) Communication configuration : point©to©point/multipoint ÃÃNote 1ÄÄ © Digit sequence integrity (DSI) is ensured for each elementary 64 kbit/s information. ÁHÁÃÃAccess attributesÄÄ ÁHÁ8) Access channel : two B (64) for user information ÁHÁ9) Access protocol : I©Series for D channel ÁHÁÃÃGeneral attributesÄÄ ÁHÁ10) Supplementary services provided À$À À$À ÁHÁ11) Quality of service À$À                    À$À for further study ÁHÁ12) Interworking possibilities À$À À$À ÁHÁ13) Operation and commercial aspects À$À 7.2ÁHÁÃÃProvision for individual bearer servicesÄÄ ÁHÁIn the following table the provision of individual circuit©mode 2 x 64 kbit/s unrestricted 8 kHz structured bearer services is given. The definition of E (essential) and A (additional) can be found in Recommendation I.230. ÁHÁa)Á   Áoverall provision: A ÁHÁb)Á   Ávariations of secondary attributes Áà81Áestablishment symmetry communication provision ƒ Áà88Áof communication configuration             ƒ Áà8RÁƒ Áà82ÁI.231.5/1 demand bidirectional pt©pt E    ƒ Áà83ÁI.231.5/2 reserved   bidirectional pt©pt A    ƒ Áà82ÁI.231.5/3 permanent bidirectional pt©pt E    ƒ       other combinations                                        A ÁHÁc)Á   Áaccess ÁHÁsignalling & OAM user information (Note 2) Áà8AÁchannel channel                              ƒ Áà84Á& rate protocols & rate protocols provision   ƒ Áà82ÁÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀ ƒ Áà8RÁƒ Áà85ÁD(16) I.451 (Note 1) 2xB(64) user©defined E       ƒ Áà87ÁD(64) I.451 (Note 1) 2xB(64)     user©defined E       ƒ ÃÃNote 1ÄÄ © Demand service only. FS for reserved permanent. ÃÃNote 2ÄÄ © Definition of protocols for OAM is for further study. 8.ÁHÁÃÃDynamic descriptionÄÄ ÁHÁThe dynamic description for this service needs further study and is not yet available. I.231.6 © ÃÃCircuit©mode 384 kbit/s unrestricted 8 kHz structured bearer serviceÄÄ           ÃÃcategoryÄÄ 1.ÁHÁÃÃDefinitionÄÄ ÁHÁThis bearer service provides the unrestricted transfer of 384 kbit/s user information over a Ho channel at the S/T reference point. The transfer of OAM information for reserved and permanent services may be provided over a D channel in the same or in another interfaces structure. 2.ÁHÁÃÃDescriptionÄÄ ÁHÁFor further study. 3.ÁHÁÃÃProceduresÄÄ ÁHÁFor further study. 4.ÁHÁÃÃNetwork capabilities for chargingÄÄ ÁHÁThis Recommendation does not cover charging principles. Future Recommendations in the D©Series are expected to contain that information. ÁHÁIt shall be possible to charge the subscriber accurately for the service. 5.ÁHÁÃÃInterworking requirementsÄÄ ÁHÁFor further study. 6.ÁHÁÃÃInteraction with supplementary servicesÄÄ ÁHÁFor further study. 7.ÂXHÂÃÃAttributes and values of attributes (including the provision ofÄÄ ÃÃindividual bearer services)ÄÄÆÆ 7.1ÂàHÂÃÃAttributes and values of attributes of the circuit©mode 384 kbit/sÄÄ ÃÃunrestricted 8 kHz structured bearer service categoryÄÄÆÆ ÁHÁÃÃAttributes/valuesÄÄ Ô k+ ÔŒÁHÁÃÃInformation transfer attributesÄÄ ÁHÁ1) Information transfer mode : Circuit ÁHÁ2) Information transfer rate : 384 kbit/s ÁHÁ3) Information transfer capability : unrestricted ÁHÁ4) Structure : 8 kHz integrity ÁHÁ5) Establishment of communication : demand/reserved/permanent ÁHÁ6) Symmetry : bidirectional symmetric/ bidirectional©asymmetric/ unidirectional (Note) ÁHÁ7) Communication configuration : point©to©point/multipoint ÃÃNote 1ÄÄ © Bidirectional©asymmetric services are for further study. ÁHÁÃÃAccess attributesÄÄ ÁHÁ8) Access channel : Ho (384) for user information D (16) or D (64) for OAM information ÁHÁ9) Access protocol : I©Series for D channel ÁHÁÃÃGeneral attributesÄÄ ÁHÁ10) Supplementary services provided À$À À$À ÁHÁ11) Quality of service À$À                   À$À for further study ÁHÁ12) Interworking possibilities À$À À$À ÁHÁ13) Operation and commercial aspects À$À 7.2ÁHÁÃÃProvision for individual bearer servicesÄÄ ÁHÁIn the following table the provision of individual circuit©mode 384 kbit/s unrestricted 8 kHz structured bearer services is given. The definition of E (essential) and A (additional) can be found in Recommendation I.230. ÁHÁa)Á   Áoverall provision: A ÁHÁb)Á   Ávariations of secondary attributes Áà81Áestablishment symmetry communication provision ƒ Áà88Áof communication configuration             ƒ Áà8RÁƒ Áà82ÁI.231.6/1 demand bidirectional pt©pt A    ƒ Áà83ÁI.231.6/2 reserved   bidirectional pt©pt E    ƒ Áà82ÁI.231.6/3 permanent bidirectional pt©pt E    ƒ Áà82ÁI.231.6/4 reserved unidirectional pt©pt A    ƒ Áà82ÁI.231.6/5 permanent unidirectional pt©pt A    ƒ Áà82ÁI.231.6/6 reserved bidirectional multipt A    ƒ Áà82ÁI.231.6/7 permanent bidirectional multipt A    ƒ Áà82ÁI.231.6/8 reserved unidirectional multipt A    ƒ Áà82ÁI.231.6/3 permanent unidirectional multipt A    ƒ ÁHÁc)Á   Áaccess ÁHÁsignalling & OAM user information (Note 1) Áà8AÁchannel channel                              ƒ Áà84Á& rate protocols & rate protocols provision   ƒ Áà82ÁÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀ ƒ Áà8RÁƒ Áà85ÁD(64) I.451 (Note 2) Ho(384) user©defined E       ƒ Áà87ÁD(16) I.451 (Note 2) Ho(384)     user©defined E       ƒ ÃÃNote 1ÄÄ © Definition of protocols for OAM is for further study. ÃÃNote 2ÄÄ © Demand service only. FS for reserved and permanent services. 8.ÁHÁÃÃDynamic descriptionÄÄ ÁHÁThe dynamic description for this service needs further study and is not yet available. I.231.7 © ÃÃCircuit©mode 1536 kbit/s unrestricted 8 kHz structured bearer serviceÄÄ           ÃÃcategoryÄÄ 1.ÁHÁÃÃDefinitionÄÄ ÁHÁThis bearer service category provides the unrestricted transfer of 1536 kbit/s user information over a H11 channel at the S/T reference point. Transfer of OAM information for reserved and permanent services may be provided via a D channel in another interface structure. 2.ÁHÁÃÃDescriptionÄÄ ÁHÁFor further study. 3.ÁHÁÃÃProceduresÄÄ ÁHÁFor further study. 4.ÁHÁÃÃNetwork capabilities for chargingÄÄ ÁHÁThis Recommendation does not cover charging principles. Future Recommendations in the D©Series are expected to contain that information. ÁHÁIt shall be possible to charge the subscriber accurately for the service. 5.ÁHÁÃÃInterworking requirementsÄÄ ÁHÁFor further study. 6.ÁHÁÃÃInteraction with supplementary servicesÄÄ ÁHÁFor further study. 7.ÂXHÂÃÃAttributes and values of attributes (including the provision ofÄÄ ÃÃindividual bearer services)ÄÄÔ k+ ÔÆÆŒ 7.1ÂàHÂÃÃAttributes and values of attributes of the circuit©mode 1536 kbit/sÄÄ ÃÃunrestricted 8 kHz structured bearer service categoryÄÄÆÆ ÁHÁÃÃAttributes/valuesÄÄ ÁHÁÃÃInformation transfer attributesÄÄ ÁHÁ1) Information transfer mode : Circuit ÁHÁ2) Information transfer rate : 1536 kbit/s ÁHÁ3) Information transfer capability : unrestricted ÁHÁ4) Structure : 8 kHz integrity ÁHÁ5) Establishment of communication : demand/reserved/permanent ÁHÁ6) Symmetry : bidirectional symmetric/ bidirectional©asymmetric/ unidirectional (Note) ÁHÁ7) Communication configuration : point©to©point/multipoint ÃÃNote 1ÄÄ © Bidirectional©asymmetric services are for further study. ÁHÁÃÃAccess attributesÄÄ ÁHÁ8) Access channel : H11 (1536) for user information D (16) or D (64) for OAM signalling ÁHÁ9) Access protocol : I©Series for D channel ÁHÁÃÃGeneral attributesÄÄ ÁHÁ10) Supplementary services provided À$À À$À ÁHÁ11) Quality of service À$À À$À for further study ÁHÁ12) Interworking possibilities À$À À$À ÁHÁ13) Operation and commercial aspects À$À 7.2ÁHÁÃÃProvision for individual bearer servicesÄÄ ÁHÁIn the following table the provision of individual circuit©mode 1536 Kbit/s unrestricted 8 kHz structured bearer services is given. The definition of E (essential) and A (additional) can be found in                   Recommendation I.230. ÁHÁa)Á   Áoverall provision: A ÁHÁb)Á   Ávariations of secondary attributes Áà81Áestablishment symmetry communication provision ƒ Áà88Áof communication configuration             ƒ Áà8RÁƒ Áà82ÁI.231.7/1 demand bidirectional pt©pt A    ƒ Áà83ÁI.231.7/2 reserved   bidirectional pt©pt E    ƒ Áà82ÁI.231.7/3 permanent bidirectional pt©pt E    ƒ Áà82ÁI.231.7/4 reserved unidirectional pt©pt A    ƒ Áà82ÁI.231.7/5 permanent unidirectional pt©pt A    ƒ Áà82ÁI.231.7/6 reserved bidirectional multipt A    ƒ Áà82ÁI.231.7/7 permanent bidirectional multipt A    ƒ Áà82ÁI.231.7/8 reserved unidirectional multipt A    ƒ Áà82ÁI.231.7/9 permanent unidirectional multipt A    ƒ ÁHÁc)Á   Áaccess ÁHÁsignalling & OAM user information (Note 1) Áà8AÁchannel channel                              ƒ Áà84Á& rate protocols & rate protocols provision   ƒ Áà82ÁÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀ ƒ Áà8RÁƒ Áà85ÁD(16) I.451 (Note 3) H11(1536) user©defined E       ƒ Áà8NÁ(Note 2)                                                        ƒ Áà87ÁD(64) I.451 (Note 3) H11(1536)    user©defined E       ƒ Áà8NÁ(Note 2)                                                        ƒ ÃÃNote 1ÄÄ © Definition of protocols for OAM is for further study. ÃÃNote 2ÄÄ © Located on another interface. ÃÃNote 3ÄÄ © Demand service only. FS for reserved and permanent services. 8.ÁHÁÃÃDynamic descriptionÄÄ ÁHÁThe dynamic description for this service needs further study and is not yet available. I.231.8 © ÃÃCircuit©mode 1920 kbit/s unrestricted 8 kHz structured bearer serviceÄÄ           ÃÃcategoryÄÄ 1.ÁHÁÃÃDefinitionÄÄ ÁHÁThis bearer service category provides the unrestricted transfer of 1920 kbit/s user information over a H12 channel at the S/T reference point. The transfer of OAM information for reserved and permanent services may be provided over a D channel. 2.ÁHÁÃÃDescriptionÄÄ ÁHÁFor further study. 3.ÁHÁÃÃProceduresÄÄ ÁHÁFor further study. 4.ÁHÁÃÃNetwork aspects for chargingÄÄ ÁHÁThis Recommendation does not cover charging principles. Future Recommendations in the D©Series are expected to contain that informaion. ÁHÁIt shall be possible to charge the subscriber accurately for the service. Ô k+ÔŒ5.ÁHÁÃÃInterworking requirementsÄÄ ÁHÁFor further study. 6.ÁHÁÃÃInteraction with supplementary servicesÄÄ ÁHÁFor further study. 7.ÂXHÂÃÃAttributes and values of attributes (including the provision ofÄÄ ÃÃindividual bearer services)ÄÄÆÆ 7.1ÂàHÂÃÃAttributes and values of attributes of the circuit©mode 1920 kbit/sÄÄ ÃÃunrestricted 8 kHz structured bearer service categoryÄÄÆÆ ÁHÁÃÃInformation transfer attributesÄÄ ÁHÁ1) Information transfer mode : Circuit ÁHÁ2) Information transfer rate : 1920 kbit/s ÁHÁ3) Information transfer capability : unrestricted ÁHÁ4) Structure : 8 kHz integrity ÁHÁ5) Establishment of communication : demand/reserved/permanent ÁHÁ6) Symmetry : bidirectional symmetric/ bidirectional©asymmetric/ unidirectional (Note 1) ÁHÁ7) Communication configuration : point©to©point/multipoint ÃÃNote 1ÄÄ © Bidirectional©asymmetric services are for further study. ÁHÁÃÃAccess attributesÄÄ ÁHÁ8) Access channel : H12 (1920) for user information D (64) for OAM information ÁHÁ9) Access protocol : I©Series for D channel ÁHÁÃÃGeneral attributesÄÄ ÁHÁ10) Supplementary services provided refer to I.250 ÁHÁ11) Quality of service À$À                   À$À ÁHÁ12) Interworking possibilities À$À for further study À$À ÁHÁ13) Operation and commercial aspects À$À 7.2ÁHÁÃÃProvision for individual bearer servicesÄÄ ÁHÁIn the following table the provision of individual circuit©mode 1920 Kbit/s unrestricted 8 kHz structured bearer services is given. The definition of E (essential) and A (additional) can be found in                   Recommendation I.230. ÁHÁa)Á   Áoverall provision: A ÁHÁb)Á   Ávariations of secondary attributes Áà81Áestablishment symmetry communication provision ƒ Áà88Áof communication configuration             ƒ Áà8RÁƒ Áà82ÁI.231.8/1 demand bidirectional pt©pt A    ƒ Áà83ÁI.231.8/2 reserved   bidirectional pt©pt E    ƒ Áà82ÁI.231.8/3 permanent bidirectional pt©pt E    ƒ Áà82ÁI.231.8/4 reserved unidirectional pt©pt A    ƒ Áà82ÁI.231.8/5 permanent unidirectional pt©pt A    ƒ Áà82ÁI.231.8/6 reserved bidirectional multipt A    ƒ Áà82ÁI.231.8/7 permanent bidirectional multipt A    ƒ Áà82ÁI.231.8/8 reserved unidirectional multipt A    ƒ Áà82ÁI.231.8/9 permanent unidirectional multipt A    ƒ ÁHÁc)Á   Áaccess ÁHÁsignalling & OAM user information (Note 1) Áà8AÁchannel channel                              ƒ Áà84Á& rate protocols & rate protocols provision   ƒ Áà82ÁÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀ ƒ Áà8RÁƒ Áà85ÁD(64) I.451 (Note 2) H12(1920) user©defined E       ƒ ÃÃNote 1ÄÄ © Definition of protocols for OAM is for further study. ÃÃNote ÄÄ2 © Demand service only. FS for reserved and permanent services. 8.ÁHÁÃÃDynamic descriptionÄÄ ÁHÁThe dynamic description for this service needs further study and is not yet available.