Call Scenarios and Applications
External Call to VDN, Answered by a Local
Station, and Transferred to a Lookahead Interflow
VDN
This scenario shows the call flow for an incoming ISDN PRI call to VDN 5678 that is answered by extension 4555 in ACD split 3333 and subsequently transferred to lookahead interflow VDN 5008 (see Figure
The transfer to VDN 5008 is completed before the call attempts the lookahead to ECS B. If the call had initiated the lookahead interflow before the transfer operation had been completed, the ASAI adjunct connected to ECS B would have received the extension 4555 as the calling party number instead of the original SID/ANI for the call.
Note that the Alerting Event Report received by the ASAI Adjunct Processor connected to ECS A is received only if the lookahead interflowed call receives alerting treatment (that is, wait hearing ringback/announcement or extension alerting) before the call is answered on ECS B. If the call waits with silence (for example, wait hearing silence) before ECS B applies ringback or answers the call, the ASAI Adjunct Processor connected to ECS A receives a
The Connected Event Report received by the ASAI Adjunct Processor connected to ECS A is triggered by the ISDN Connect message received from ECS B. ECS B provides a single ISDN Connect message with the first answer treatment provided. For example, listening to music or to an announcement while the call is in vector processing triggers ECS B to send an ISDN Connect message to ECS A. ECS B does not send additional ISDN messages to ECS A for subsequent answers (for example, other announcements or answered by a station). Therefore, the ASAI Adjunct Processor connected to ECS A does not receive further answer/connect notifications for the call.
Also note that the ISDN called number received by the adjunct connected to ECS A is not the same as the VDN number, since ISDN digit manipulation has occurred.
Assume that VDNs 5678 and 5008 are monitored over CRVs 98 and 80, respectively, by an ASAI Adjunct Processor connected to ECS A and that VDNs 1111 and 1222 are monitored over CRVs 20 and 26, respectively, by an ASAI Adjunct Processor connected to ECS B. Messages in italics refer to messages exchanged by ECS B and the ASAI Adjunct Processor connected to ECS B.
