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Call Scenarios and Applications
A-66 Issue 7 March 1998
Call Sequence 3 shows an incoming ISDN PRI call to ECS A, delivered to VDN1.
The incoming ISDN call contains UUI data. While in VDN1, the call is routed to
VDN3 in ECS B including UUI information and a return call destination (VDN11).
ECS B connects the call to VRU Port2. After the VRU terminates the caller
session, the ASAI host drops the call including UUI information back to ECS A.
When the trunk to ECS B drops, the call is directed to VDN11. The host on ECS A
drops the call including UUI information in the request.
Call Sequence 3:
Host A Host B Comment
Call Offered
(called=VDN1, UUI=info0)
Route Request
(called=VDN1, domain=VDN0,
Route Select
(called=VDN3, UUI=info3,
Route End
Call Offered
(called=VDN3, domain=VDN3,
Connected Event
Drop Event
(connected=####, UUI=info4)
Alert Event
(called=VDN3, connected=####)
UUI=info3)
Call delivered to VRU
UUI=info0)
return call dest=VDN11)
(called=VDN3, connected=####)
Call Offered
(called=VDN1, domain=VDN11,
UUI=info4)
3P Drop Request
(UUI=info5)
3P Drop ACK
Call Ended
Alert Event
(called=VDN3,
connected=VRU port 2,
Connected Event
(called=VDN3,
connected = VRU port 2)
3P Drop Request
(UUI=info4)
3P Drop ACK
Call Ended Event
VRU disconnects,
provides UUI
Call delivered to
Return VDN
Host drops call
UUI=info3)