ÿWPCL ûÿ2BJ|xÐ ` ÐÐÌÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿH øxÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÌÐÐ °°°è ÐÑ Âx„|ü@Ž ÑÐ Å°6Ø'°6Ø'Å ÐÓÓÃÃSECTION 7ÄÄ © SUPPLEMENTARY SERVICES ÃÃRecommendation Q.80ÄÄ Áà+ÁINTRODUCTION TO STAGE 2 SERVICE DESCRIPTIONSƒ Áà4ÁFOR SUPPLEMENTARY SERVICESƒ ÁàAÁƒ Áà=ÁÃÃContentsÄă ÁàAÁƒ 1.ÁHÁIntroduction 2.ÁHÁCross©references 3.ÁHÁRelationships among supplementary services Ð   ÐAnnex I © Cross©reference list of Stage 1 and Stage 2 Recommendations on supplementary services ÁààIÁ*ƒ ÁààIÁƒ ÁààHÁ*     *ƒ ÁààIÁƒ ÃÃSECTION 7ÄÄ © SUPPLEMENTARY SERVICES ÃÃRecommendation Q.80ÄÄ Áàà3ÁINTRODUCTION TO STAGE 2 SERVICE DESCRIPTIONSƒ Áàà<ÁFOR SUPPLEMENTARY SERVICESƒ 1.ÁHÁÃÃIntroductionÄÄ Ð X ÐÁHÁThe purpose of this Recommendation is to provide an introduction to the Stage 2 service descriptions for supplementary services, given in Recommendations Q.81©87. 2.ÁHÁÃÃCross©referencesÄÄ ÁHÁThe work in Recommendations Q.81©87 is based on the Stage 1 service descriptions given in the I.251©2570©Series Recommendations (see Annex I). They are coordinated with the Stage 2 service description for basic calls, given in Recommendation Q.71, and were developed according to the methodology given in Recommendation Q.65. 3.ÁHÁÃÃRelationships among supplementary servicesÄÄ 3.1ÁHÁÃÃCall Diversion ServicesÄÄ ÁHÁRecommendation I.252, ÀÀÀÀ 2©5, defines a ÃÃsetÄÄ of supplementary services called "Call Diversion Services". This set consists of the Call Forwarding supplementary services and the Call Deflection supplementary service. This section describes how these services relate to each other and describes the different network routing techniques which may be used to provide these services. It begins with the latter topic. ÁàÀMÁAnnex 1ƒ ÁàÀPÁƒ ÁàÀAÁ(to draft Recommendation Q.80)ƒ ÁàÀPÁƒ ÁàÀ;ÁÃÃCross©reference list of Stage 1 and Stage 2Äă ÁàÀ:ÁÃÃRecommendations on supplementary servicesÄÄ 1ƒ ÁàÀPÁƒ ÃÃStage 2ÄÄÁ  ÁÁ øÁÁx!ÁÁ!ð"Á ÃÃBased on Stage 1 given inÄÄ: ÃÃQ.80ÄÄ © ÃÃIntroduction to Stage 2 ServiceÄÄ        ÃÃDescriptions for SupplementaryÄÄ        ÃÃServicesÄÄÁ  ÁÁ øÁ ÃÃQ.81ÄÄ © ÃÃNumber Identification SupplementaryÄÄ ÃÃI.251ÄÄ ÃÃServicesÄÄ ÀÀ 1 Direct Dialling InÁx!Á I.251, ÀÀ 1 (ÀÀ 2) Multiple Subscriber Number I.251, ÀÀ 2 ÀÀ 3 CLIP I.251, ÀÀ 3 ÀÀ 4 CLIR I.251, ÀÀ 4 ÀÀ 5 COLP I.251, ÀÀ 5 ÀÀ 6 COLR I.251, ÀÀ 6 (ÀÀ 7) Malicious Call ID (I.251, ÀÀ 7) (ÀÀ 8) Sub©Addressing (I.251, ÀÀ 8) ÃÃQ.82ÄÄ © ÃÃCall Offering Supplementary ServicesÄÄ ÃÃI.252ÄÄ (ÀÀ 1) Call Transfer I.252, ÀÀ 1 ÀÀ 2 Call Forwarding Busy I.252, ÀÀ 2 ÀÀ 3 Call Forwarding No Reply I.252, ÀÀ 3 ÀÀ 4 Call Forwarding Unconditional I.252, ÀÀ 4 (ÀÀ 5) Call Deflection (I.252, ÀÀ 5) ÀÀ 6 Line Hunting I.252, ÀÀ 6 ÃÃQ.83ÄÄ © ÃÃCall Completion Supplementary ServicesÄÄ ÃÃI.253ÄÄ ÀÀ 1 Call Waiting I.253, ÀÀ 1 ÀÀ 2 Call Hold I.253, ÀÀ 2 (ÀÀ 3) CCBS (I.253, ÀÀ.3) ÃÃQ.84ÄÄ © ÃÃMulti©Party Supplementary ServicesÄÄ ÃÃI.254ÄÄ (ÀÀ 1) Conference Calling I.254, ÀÀ 1 (ÀÀ 2) Three©Party I.254, ÀÀ 2 ÃÃQ.85ÄÄ © ÃÃ"Community of Interest" SupplementaryÄÄ ÃÃI.255ÄÄ ÃÃServicesÄÄ ÀÀ 1 Closed User Group I.255, ÀÀ 1 (ÀÀ 2) ISDN Networking Services (I.255, ÀÀ 2) Private Numbering Plan ÃÃQ.86ÄÄ © ÃÃCharging Supplementary ServicesÄÄ ÃÃI.256ÄÄ ÀÀ 1 Credit Card Calling I.256, ÀÀ 1 ÀÀ 2 Advice of Charge I.256, ÀÀ 2 (ÀÀ 3) Reverse Charging (I.256, ÀÀ 3) ÃÃQ.87ÄÄ © ÃÃAdditional Information TransferÄÄ ÃÃI.257ÄÄ ÃÃSupplementary ServicesÄÄ Ô ñ,ÔŒÀÀ 1 User©to©User Signalling I.257, ÀÀ 1 Parentheses "( )" around a ÀÀ of a Recommendation number implies that the ÀÀ may not appear in the 1988 CCITT Recommendations.