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5-12 Call control procedures
Figure 5-5
Q.931 message sequence for PRI-to-PRI call setup
Originating
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:
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.
297-2521-106 Standard 23.01 March 2001
user
SETUP (CR,CID, NSF, CDN, CGN,
DIE, OCN, RGN)
CALL PROC
(Translations and routing complete) SETUP (CR, CID, BC, NSF, CDN,
ALERT
NOTIFY
NOTIFY
CONN
(BIlling starts)
CONN ACK
Note: Dashed lines indicate optional messages.
standard translation—tables HNPACONT, FNPACONT, CTRTE, CCTR
VNET translation—tables VPNTRMRT, VPNIMTRT
Network
CGN)
CALL PROC
ALERT
NOTIFY
NOTIFY
CONN
CONN ACK
Terminating
user
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