ITU-T SERIES Q SUPP 14-1999 Technical Report TRQ 2120 Coordinated Call Control and Bearer Control Signalling Requirements - Third Party Coordinated Call and Bearer Control Series Q.pdf

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1、STDmITU-T RECMN SERIES Q SUPP L4-ENGL 3999 E 4862573 0683707 907 9 INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STAN DARD IZATI ON SECT0 R OF ITU Series Q Supplement 14 (1 2/1999) SERIES Q: SWITCHING AND SIGNALLING Technical Report TRQ.2120: Coordinated call control and bearer contr

2、ol signalling requirements - Third party coordinated call and bearer control ITU-T Q-series Recommendations - Supplement 14 (Formerly CCITT Recommendations) STD*ITU-T RECMN SERIES P SUPP L4-ENGL 1999 II YB62591 0b83908 BY3 E ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE I

3、NTERNATIONAL MANUAL SERVICE INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORKING FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN SPECIFICATIONS OF SIGNALLING SYSTEMS No. 4 AND No. 5 SPECIFICATIONS OF SIGNALLING SYSTEM No. 6 SPECIFICATIONS OF SIGNALLING SYSTEM RI SPECIFICATIONS OF SIGNALLING S

4、YSTEM R2 DIGITAL EXCHANGES INTERWORKING OF SIGNALLING SYSTEMS SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. I PUBLIC LAND MOBILE NETWORK INTERWORKING WITH SATELLITE MOBILE SYSTEMS INTELLIGENT NETWORK CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS SIGNALLING REQUIRE

5、MENTS AND PROTOCOLS FOR IMT-2000 BROADBAND ISDN Q.1-Q.3 Q . all users of this Supplement are therefore encouraged to investigate the possibility of applying the most recent edition of the supplements and other references listed below. A list of the currently valid ITU-T Recommendations and supplemen

6、ts are regularly published. i ITU-T Q-series Recommendations - Supplement 7 (1999), Technical Report TRQ.2001: General aspects for the development of unified signalling requirements. 2 3 ITU-T Q-series Recommendations - Supplement 1 O (1 999), Technical Report TRQ. 2002: Information Flow Elements .

7、ITU-T Q-series Recommendations - Supplement 12 (1999), Technical Report TRQ.2100: Coordinated call control and bearer control signalling requirements - Root-par coordinated call and bearer control. ITU-T Q-series Recommendations - Supplement 2 1 (1 999), Technical Report TRQ.2320: Bearer control sig

8、nalling requirements - Third-par bearer control. 4 3 Definitions This Supplement defines the following terms: 3.1 bearer branch owner: One who adds a bearer branch to a network connection is the owner of that bearer branch. There may be several Bearer Branch owners per network connection. A Bearer B

9、ranch owner may be associated with the root, a leaf, or a party not attached to the network Connection. 3.2 call: An end-to-end communications service between two- or more call party end points, or between one call party end point and its Serving Node. 3.3 call owner: One who initiates a call is the

10、 Call Owner. There is only one Call Owner per call. 3.4 network connection: An ATM network connection of topology type 1 to 5 as defined in Supplement 7. 3.5 network connection owner: One who initiates a network connection is the Network Connection Owner. There is only one Network Connection Owner p

11、er network connection. There may be several Network Connection Owners per call. A Network Connection Owner may be associated with the root, a leaf, or a party not attached to the network connection. 3.6 party owner: One who adds a party to a call is the owner of that party. There may be several part

12、y owners within a call. 3.7 relay node: Network equipment, such as a transit bearer exchange, which contains a bearer control functional entity but no call control functional entity. 3.8 root party: A bearer end point that communicates with one or more parties through a single user plane connection,

13、 such as the source end point of a type 2 connection. 3.9 serving node: Network equipment, such as a local exchange (LEX) or private branch exchange (PBX), which contains call control and bearer control functional entities. 3.10 third party: A party requesting actions on a call and bearer operation

14、that will not be a connection endpoint of the designated bearer. 4 Abbreviations This Supplement uses the following abbreviations: ATM Asynchronous Transfer Mode B-ISDN LEX Local Exchange PBX Private Branch Exchange Broadband Integrated Services Digital Network STD-ITU-T RECMN SERIES Q SUPP 34-ENGL

15、1779 H 4862573 nb83q14 047 5 Table 5-1 contains the information flows for control by a third party that are used across the call control and bearer control interfaces as described in Supplement 7 13. These information flows are used to establish, modify and release third-party calls and network conn

16、ections. Information Flows used in this Supplement Information Flow CALL- and establishing a call and a type 2 network connection with more than two parties. In both variations, the establishment is the result of a request by a third party. The number of called parties determines whether the one-pha

17、se or two-phase request mechanism is utilised. 7.1 One example variation of this capability will be illustrated in this subclause. This variation is as follows: 1) Call and network connection establishment by a party other than one of the two parties to be attached to the network connection without

18、network initiated “look-ahead“. 2) Call and network connection establishment by a party other than one of the two parties to be attached to the network connection with network initiated “look-ahead“. The overview of the type 1 simultaneous call and network connection establishment capabilities is co

19、ntained in the following subclauses. Call and Type 1 Network Connection Establishment 7.1.1 The User (party D) requests a three-party call between party A, B, and party D. One network connection is to be associated with this call. parties A and B are to be attached to the network connection. The use

20、r (party D) also specifies the higher layer service to be carried on this network connection and the desired network bearer service that should be established. The requested service does not require human interaction. Therefore, immediate answer can be performed by the party As and party Bs equipmen

21、t. If both the requested parties equipment can accept the requested service, the designated attachment method, and specified bearer service, the equipment will indicate Call and Network Connection Establishment - Single Network Connection by a Third Party -Without Look-Ahead STD-ITU-T RECMN SERIES Q

22、 SUPP 14-ENGL L999 m 48b2574 Ob83937 856 W acceptance of the call and network connection request. This example also assumes that both requested parties are connected to a multi-signalling entity interface. In addition, the network does not perform a “look-ahead“ procedure before progressing with the

23、 network connection establishment. Figure 7-1 illustrates the before and aAer view of this example. Requester TI 1 108BX100 Figure 7-1 - Call and bearer transition diagram The signalling capability of simultaneously establishing a call between three parties and establishing a point-to-point Network

24、Connection between two of these parties without network “Look-ahead“ is illustrated in Figure 7-2. This request was issued by party D who will not be attached to the requested Network Connection. NETWORK Relay Figure 7-2 - Call and single Network Connection (between A and B) - Establishment by a Thi

25、rd Party The actions illustrated in Figure 7-2 are as follows. Requesting partys (party D) terminal equipment issues information flow 1 towards its serving node. STDmITU-T RECMN SERIES Q SUPP L4-ENGL 1777 0 4862573 Ob83CiLB 792 E 1 Call- and adding a party to a call and establishing a new type 1 network connection between the new party and one of the existing parties. In both variations, the addition of the party is requested by a third party. The number of called parties determines whether the one-phase or two-phase request mechanism is utilised.