CEPT T CS 20-25 E-1982 Call Diversion《呼叫转移》.pdf
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1、CEPT T/CS*20-25*E 82 = 2326434 0004558 4 W G9 20-25 Page 1 E Recommendation T/CS 20-25 (Vienna 1982) CALL DIVERSION Recommendation proposed by Working Group T/WG .11 “Switching and Signalling” (CS) Text of the Recommendation adopted by the “Telecommimications” Commission: “The European Conference of
2、 Postal and Telecommunications Administrations, considering - that in accordance with the principles outlined in Recommendation TICS 20-01 i, the exchange and network features which are required for the implementation of services and facilities should be identified and specified; - that in several C
3、EPT member countries, supplementary services will be offered which imply the diversion of a call to another telephone number, to an operator or to a device producing an audible indication; - that it is desirable to handle such calls in a standardised way especially when these calls are crossing bord
4、ers, o secommends that the members recognise and use the following definitions, arrangements and specifications for the feature call divession.” 1. DEFINITION The call diversion feature is the ability of the network to route a call, during the set-up phase, to a destination other than that indicated
5、 by the address information received from the origin of the call. 2. DESCRIPTION 2.1. The following terminology applies : A = the origin of the call; B = the destination of the call as indicated by the address information sent by A; C = the destination to which the call has to be diverted according
6、to the conditions applying at B; D = the destination to which the call has to be diverted according to the conditions applying at C. The A-exchange is the exchange to which A is connected; the same applies when A is substituted by B, C or D. The I-exchange is an intermediate exchange on the call pat
7、h from the A-exchange to the B-exchange, from where a new call path to C may be Set-up. 2.2. Depending on the conditions applying at B, the call may be routed to: (a) another subscriber termination; (b) a public network operator; (c) tone or announcing equipment; other than that indicated in the ori
8、ginal address information. This implies that: - a new call path has to be Set-up from the A-, I- or B-exchange to C; - the established OS seized call path has to be cleared at the point from which the new call path is to be The diversion of the call may take place: (a) immediately, i.e. as soon as t
9、he call arrives at B; (b) on no reply, i.e. after a certain time during which the ringing condition has been applied to B; (c) on busy, i.e. only if B is busy. Set-up (this will not apply if the new call path is Set-up from the B-exchange). 2.3. Note: The studies on this series (T/CS 20) of Recommen
10、dations for the features in an analogue environment has now been terminated. A continuation of the studies has started with the aim to amend these existing features, where necessary, and to specify new features for the ISDN. These Recommendations will be gathered in a new series of Recommendations.
11、- Edition of May 15, 1986 .CEPT T/CS*20-25*E 82 2326YLLi OOOLi559 b H TICS 20-25 Page 2 2.4. 3. 3.1. 3.2. 3.3, 3.4. 3.4.1. From the routing point of view the following types of call diversion are identified: (a) internal diversion, when C is connected to the same exchange as B or to a remote control
12、led switching unit, which is controlled by the -exchange; (b) call forwarding, if the new call path is Set-up from the -exchange to another exchange; (c) rerouting, if the new call path is set-up froin the A- or an I-exchange; (d) drop back, in the case of diversion to tone or announcing equipment,
13、connected to the A- or an I-exchange. Note: The transfer of an established (answered) call (as required by the fi111 three-parry service) is not covered by the feature call diversion. TECHNICAL CHARACTERISTICS When applying call diversion, the following aspects require special attention : - addition
14、al signalling for call Set-up; - transmission quality; - prevention of multiple diversion of calls; - charging aspects; - post-dialling delay; - exceptional treatment of calls involved in call diversion. These aspects will be treated in the following paragraphs, with respect to the different types o
15、f call diversion from the routing point of view where applicable. Additional signalling for call set-up The additional signalling feature as described in Recommendation T/CS 20-26 2 will be required in combination with the call diversion feature as follows: - with call forwarding, additional signall
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- CEPTTCS2025E1982CALLDIVERSION 呼叫转移 PDF
