1、CEPT T/CS*49-09*E 9 2326414 0005055 5 TJCS49-09E Page 1 Recommendation T/CS 49-09 (Cannes 1983, revised in Nice 1985) SYSTEM L, MULTIFREQUENCY CODE SUPPLEMENTARY SERVICES Recommendation proposed by Working Group T/WG 11 “Switching and Signalling” CS Text of the Recommendation adopted by the “Telecom
2、munications” Commission, “The European Conference of Postal and Telecommunications Administrations, considering - that supplementary services Automatic number identification (ANI) Completion of calls to busy subscriber (CCBS) Call waiting Call diversion are commonly used in private automatic branch
3、exchanges (PABXs), - that SPC PABXs allow a flexible introduction of these supplementary services, - that signalling system LI with multifrequency code interregister signalling is in use for the signalling over leased lines between PABXs, - that in accordance with the principles of Multifrequency co
4、de interregister signalling outlined in Recommenda- tions T/CS 49-07 i and T/CS 49-08 2 sufficient codes are provided to support the signalling for supplementary services, - that standardisation of the signalling for supplementary services between PABXs favours harmonisation of user control procedur
5、es, systems and equipment, recommends the procedures specified in this Recommendation when using the L, multifrequency code interregister signalling system to transmit supplementary service information.” O The study is going on and more supplementary services will be implemented. Edition of November
6、 15, 1986 I I CEPT T/CS*49-09*E 2326434 000505b 7 TICS 49-09 E Page 3 1. GENERAL I. 1. Introduction to Supplementary Services Supplementary services detailed within this Recommendation provide facilities in addition to fast call Set-up to the user of a PABX. A supplementary service request may be ma
7、de during call Set-up, prior to conversation, or during conversation by means of a register recall procedure. Details of the request procedures are shown in Recommendations T/CS 49-07 i and T/CS 49-08 2. Request for a supplementary service is made by means of a two signal message. There are three ty
8、pes of supplementary service requests: a) Forward Service Request, indicated by a two signal message within Group IV during call Set-up. b) Service Request on Recall, indicated by a two signal message from Group IV following either a Forward c) Backward Servce Request, indicated by a two signal mess
9、age within Group D during call Set-up. The signalling requirements for each service are detailed within the relevant service description (see Tables 1 and 2 T/CS 49-09). The meanings of Group IV/D signals following the two signal supplementary service request will differ depending on the service con
10、cerned and are given in the relevant service description. Some services require more signals than are available in Group IV/D, in which case additional groups are allocated within the service (e.g. Groups VI/F). The signals allocated in Group VI/F, etc. are specific for the service concerned and may
11、 differ between services. On completion of a supplementary service the signalling is normally returned to Group III/C of Recommen- dation T/CS 49-08 2 where further supplementary services can be requested, or the call completed. An exception to the above is the two signal message IV-12, IV-12, which
12、 causes immediate change-over to Group I and A signalling and does not enter into service specific signalling procedures. This message is used subsequent to Link Recall to establish an enquiry call via the same private circuit as the original call. Entry and exit points between the SDL, diagrams in
13、a service and the SDL diagrams of Recommendation T/CS 49-08 2 are shown by means of connectors, designated X, Y and Z, see Figures 5-8 (T/CS 49-09). The signalling procedure for rejection of a Supplementary Service within the services is common. The procedures are shown in Figures 1-4 (T/CS 49-09) a
14、nd are applicable at any point within the service. or Backward register recall. 1.2. Ailocation of Two Signal Messages The first signal of a two signal message indicates the category of the Supplementary Service as shown below. Signals 1-9 Manufacturer Specific signalling procedures. Each manufactur
15、er has a unique category number. Signal IO An escape to a second category digit. Signals 11- 14 Procedures specified by Administrations. Signal 15 Procedures originated by CEPT. Where a service, initially specified by individual Administrations, is subsequently adopted by CEPT the original two signa
16、l message (i.e. in the range 11-14) will be retained. The allocations are listed within this Recommendation. Edition of November 15, 1986 CEPT T/CS*49-09*E = 232b4L4 0005057 9 TICS 49-09 E Page 4 2nd Group IV Signal 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6 7 8 9 11 12 13 14 15 Message Request
17、 Call Back Call Back Attempt Diversion Bypass Free Notification Request Request ANI Request Executive Intrusion Call Waiting Operator Intrusion 1 Request Override Operator Recall Request Re-Ring Request Camp-on Free Notification Request Called Party Identity Cancel Call Back Reverted Call Back Attem
18、pt Diversion Activation on Ring Tone No Reply Revert to Selection Phase; Changeover to GPI/A r/cs 49-09 Section 3 3 3 2 * 4 * * * * 3 3 3 * * 1 * Reserved. Table 1 (T/CS 49-09). Two signal messages for forward supplementary service requests. Edition of November 15, 1986 CEPT T/CS*49-09*E W 2326434 0
19、005058 O TICS 49-09 E Page 5 * Reserved. 2nd Group IV Signal 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Message ANI Request Request Immediate Diversion (own PABX) Request Immediate Diversion (off PABX) Request Diversion on RTNR TICS 49-09 Section Table 2 (T/CS 49-09). Tw
20、o signal messages for forward supplementary service requests. CEPT T/CS*49-09*E 2326414 0005059 2 TICS 49-09 E Page 6 u.lglmtlIl dlglts (7) dlgit Dlglt 1-10 (7) I send/ digit Figure 16 (T/CS 49-09). Request call back (originating PABX). Edition of November 15, 1986 CEPT T/CS*47-07* 2326414 0005080 4
21、 / TICS 49-09 E Page 27 calling Ilne Idalt I ty il-il Dlglt 1-10 IU1-IO) (T) dlglt 10-15) Figure 18 (T/CS 49-09). Call back attempt (originating PABX). call Irg psty IdPntlty Edition of November 15, 1986 CEPT T/CS*49-09*E 232b414 0005082 8 = TICS 49-09 E Page 29 Edition of November 15, 1986 Follwlnq
22、 tua signal ssagp of call bad attapt ii-ll+H-21 T/U 49-011 191 11 : dl It dlglt dlgl ts u-151 Olglt (n1-101 mt dl It q T/CS 3 59-08 i91 Figure 19 (T/CS 49-09). Call back attempt (terminating PABX). CEPT T/CS*49-09*E m 232b4LQ 0005083 T m TICS 49-09 E Page 30 From Figure 29 T/CS 49-08 Following two s
23、ignal message of 93 cancel call back (IV-12 + IV-7) I I I Signalling as for request call back (Figure 16 T/CS 49-09) Figure 20 (T/CS 49-09). Cancel call back from originating extension (originating PABX). From Figure 39 T/CS 49-08 Following two signal message of T-L- cancel call back (IV-12 + IV-7)
24、I I I Signalling as for request call back (Figure 17 T/CS 49-09) Figure 21 (T/CS 49-09). Cancel call back from originating extension (terminating PABX). O From Figure 29 T/CS 49-08 Following two signal message of ? reverted call back attempt (IV-12 + IV-8) I I I Signalling as for call back attempt (
25、Figure 16 T/CS 49-09) Figure 22 (T/CS 49-09). Reverted call back attempt (originating PABX). Edition of November 15, 1986 CEPT T/CS*49-07*E 2326434 0005084 3 E TICS 49-09 E Page 31 From Figure 39 TICS 49-08 Following two signal message of reverted call back attempt (IV-I2 + IV-8) I I I Signalling as
26、 for call back attempt (Figure 17 T/CS 49-09) Figure 23 (T/CS 49-09). Reverted call back attempt (terminating PABX). From Figure 29 T/CS 49-08 Following two signal message of w free notification (IV-12 + IV-5) I I I Signalling as for call back attempt (Concluding at end of digits) (Figure 16) Figure
27、 24 (T/CS 49-09). Free notification (originating PABX). From Figure 39 T/CS 49-08 Following two signal message of free notification (IV-12 + IV-5) I I I Signailing as for call back attempt (Concluding at end of digits) (Figure 17) Figure 25 (T/CS 49-09). Free notification (terminating PABX). O Edition of November 15, 1986
