Call Scenarios and Applications
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,
UUI=info0)
Route Select
(called=VDN3, UUI=info3,
return call dest=VDN11)
Route End
Call Offered
(called=VDN3, domain=VDN3,
UUI=info3)
Alert Event | Alert Event | Call delivered to VRU |
(called=VDN3, connected=####) | (called=VDN3, |
|
| connected=VRU port 2, |
|
| UUI=info3) |
|
Connected Event | Connected Event |
|
(called=VDN3, connected=####) | (called=VDN3, |
|
| connected = VRU port 2) |
|
| 3P Drop Request | VRU disconnects, |
| (UUI=info4) | provides UUI |
Drop Event | 3P Drop ACK |
|
(connected=####, UUI=info4) |
|
|
| Call Ended Event | Call delivered to |
|
| |
Call Offered |
| Return VDN |
(called=VDN1, domain=VDN11, |
|
|
UUI=info4) |
|
|
3P Drop Request |
| Host drops call |
(UUI=info5) |
|
|
3P Drop ACK |
|
|
Call Ended |
|
|
