CEPT T CS 21-01 E-1983 Call Handling Information Flow《呼叫处理信息流》.pdf
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1、CEPT T/CS*iL-OL*E 83 W 2326434 00045b 7 W Page 1 21-01 E Recommendation T/CS 21-01 (Cannes 1983) CALL HANDLING INFORMATION FLOW Recommendation proposed by Working Group T/WG 11 “Switching and Signalling” (CS) Text of the Recommendation adopted by the “Telecommunications” Commission: “The European Co
2、nference of Postal and Telecommunications Admiqistrations, considering - that basic and supplementary services should be harmonized; - that for those supplementary services for which cooperation between exchanges is required, the additional - that the elements of information to be passed between exc
3、hanges by means of additional signailing should be signalling feature according to Recommendation T/CS 20-26 11 provides a recommended basis; specified; that the way in which the additional signalling information should be passed between exchanges should be specified in conjunction with the other ca
4、fi handiing information to be pasied, especially to enable; harmonized international interworking; - that a common, unique and concise way of depicting the cd handling information flow WU speed up the process of its specification, recommends - that the members draw up specifications of the call hand
5、ling information flow for supplementary and other new - to employ for these specifications the CCIT Specification description language and caii handling sequence charts services as far as possible independently from signalling systems before working out implementations; as outlined below.” 1. CCm SP
6、ECIFICATION AND DESCRTPTION LANGUAGE Where appropriate, the processes involved in the Cali handling information flow within both the outgoing and the incoming exchange are presented in Specication and description language (SDL) form in accordance with CCITT Recommendations 2.100 to Z. 104 2. 2. CALL
7、 HANDLING SEQUENCE CHARTS When a more concise presentation of the call handling information flow is desirable and sufficient, the method Call handling sequence charts as described in the Annex to this Recommendation may be used. It is then essential to follow the rules set-out in the Annex. For the
8、time being, the Recommendations of Group T/CS 21 include call handling sequence charts in accordance with the Annex to this Recommendation. O References 11 CEPT Recommendation T/CS 20-26. Additional Signalling. 2 CCITT Recommendation Z. 100 to Z. 104. Functional specSfication and description languag
9、e (SDL). Edition of May 15, 1986 - CEPT T/CS*ZL-OL*E 3 II 2326434 0004569 9 TICS 21-01 E Page 2 Annex. Call handling sequence charts 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. The purpose of a call handling sequence chart is to show which information has to be passed between exchanges fo
10、r the call handling of a service or supplementary serviceand to show the sequence in which this should occur. Besides, a call handling sequence chart should contain all other relevant information for the understanding of the call handling process. The information in a call handling sequence chart is
11、 subdivided into the following items: (a) signalling information to be passed between exchanges; (b) signalling information to be passed from exchange to user, and vice versa; (c) audible or visual indications to be passed from exchange to user; (d) specific actions to be performed by exchanges. For
12、 each exchange which has a significant role in the call handling, a separate column is established. Signalling information to be passed between exchanges is represented by a line starting in the middle of the column of the sending exchange and ending in the middle of the column of the receiving exch
13、ange with an arrow head at the latter end. Signalling information which is to be considered as additional signalling information according to Recommen- dation T/CS 20-26 i should be specified in the form of service instructions, i.e. independent of any signalling system. The flow of signalling infor
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