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vii
BRI Channel Initialization and Start Up (Network Side) ...................................369
PRI Channel Initialization and Start Up .............................................................370
Normal Call Establishment and Termination......................................................371
Network initiated call (inbound call) ............................................................371
Network terminated call................................................................................374
Application initiated call (outbound call)......................................................378
Aborting cc_MakeCall( ) ..............................................................................380
Application Terminated Call.........................................................................381
Call Rejection .....................................................................................................385
Outgoing call rejected by the network ..........................................................385
Incoming call rejected by the application .....................................................386
Glare Condition 1: Call collision occurs after the SETUP message is sent
to the network.......................................................................................388
Glare Condition 2: Call collision occurs before the SETUP message is sent
to the network.......................................................................................390
Simultaneous disconnect (any state) .............................................................392
Initiation of Hold and Retrieve (BRI and PRI DPNSS/Q.SIG Protocols Only) .394
Hold and retrieve - local initiated .................................................................395
Hold and retrieve - remote initiated ..............................................................396
Network Facility Request or Service ..................................................................397
Vari-A-Bill (AT&T Service Only)................................................................397
ANI-on-demand - incoming call (AT&T Service Only) ...............................398
Advice of charge - inbound and outbound call (AT&T Service Only) .........399
Two B Channel Transfer (TBCT).......................................................................400
Non-Call Associated Signaling (NCAS).............................................................409
User-initiated call..........................................................................................410
Network-initiated call ...................................................................................413
Appendix B - DPNSS Call Scenarios...............................................................415
Executive Intrusion - Normal..............................................................................416
Executive intrusion - with prior validation .........................................................416
Local diversion - outbound.................................................................................417
Local diversion - inbound...................................................................................417
Remote diversion - outbound..............................................................................418
Remote diversion - inbound................................................................................419
Transfer ..............................................................................................................420
Virtual call -outbound.........................................................................................422
Virtual call - inbound..........................................................................................423
Appendix C - IEs and ISDN Message Types for DPNSS...............................425