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ASAI and Call Control
4-16 Issue 7 May 1998
■ Attempting to use a Trunk Access Code (TAC) to access a PRI trunk (only
Automatic Alternate Routing/Automatic Route Selection [AAR/ARS] feature
access codes may be used to place a Switch-Classified call over a PRI
trunk) (cause CS0/21 — Call Rejected)
■ No classifiers available
(cause CS3/21 — Classifiers not available)
■ Resources not available (for example, time slots or association records) —
NAK/Return Error component (cause CS3/40 — Resources not available)
■ Receipt of a RELease COMplete message from the adjunct.
These conditions result in a Third Party Call Ended message.
ECS Operation for Switch-Classified Call Setup
This section details the ECS actions for each stage of call setup.
After the initial alert event is reported, the ECS waits for the call to be classified as
answered or dropped. The Alerting Event Report is sent to the adjunct only for the
first ringing occurrence.
If Call Classification after Answer Supervision is enabled, the ECS will rely on
network answer supervision to classify the call. A call classifier will only be
attached after the call is answered and only if answer machine detection is
requested.
If network answer supervision is received before the classifier detects answer, the
classifier is disconnected. If the classifier detects the answer, any subsequent
network answer supervision indications are ignored.
2
After the answered event is reported (call answered at the called party), the ECS
terminates the call at the originator specified in the Third Party Make Call request.
Valid originators are ACD split extensions, hunt group extensions, announcement
extensions, or VDNs.
When the ECS determines that the originator (ACD split) can accept the call, the
call is transferred to the ACD split (the sequencing is done internal to the ECS).
The event report sent to the adjunct depends on whether the call has been
delivered to an available agent/extension or has been queued. If the call drops
prior to getting to the originator, the Third Party Call Ended Report is sent to the
adjunct.
If the call has been queued, the Queued Event Report is sent to the adjunct.
When the agent becomes available, the call is de-queued and an Alerting Event
Report followed by a Connected Event is sent containing the extension receiving
the call.
2. See Answering Machine Detection operation for G3V3
and later ECS releases in this section.