5-12 Call control procedures
297-2521-106 Standard 23.01 March 2001
Figure 5-5
Q.931 message sequence for PRI-to-PRI call setup
Originating
user
Network
Terminating
user
SETUP (CR,CID, NSF, CDN, CGN,
DIE, OCN, RGN)
CALL PROC
(Translations and routing complete)
SETUP (CR, CID, BC, NSF, CDN,
CGN)
CALL PROC
ALERT
ALERT
NOTIFY
NOTIFY
NOTIFY
NOTIFY
CONN
CONN
(BIlling starts)
CONN ACK
CONN ACK
Note: Dashed lines indicate optional messages.
Termination translation to a PRI is achieved by datafilling the following
translation tables with the PRI trunk common language location identifier
(CLLI) as the route choice:
• standard translation—tables HNPACONT, FNPACONT, CTRTE, CCTR
• VNET translation—tables VPNTRMRT, VPNIMTRT
After a PRI is selected from the route choice of the above tables, a setup
message is outpulsed on the terminating PRI. The calling party number, if
available, is optionally delivered to the terminating PBX.
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