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Call Scenarios and Applications
A-34 Issue 7 March 1998
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 A-5). The call is accepted by the
receiving ECS (ECS B), waits in queue until the vector announcement (VDN
1222, vector N) and is abandoned by the caller while the call is alerting extension
1567. The lookahead display information is the VDN name provided on the VDN
administration form.
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
Cut-Through/Progress Event Report. Subsequent Alerting and Connected Event
Reports are provided, depending on the call treatment provided by vector
processing.
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.