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ASAI and Call Control
Issue 7 May 1998
4-13
The following lists the conditions that can be detected:
Answer Classification
The Answer Classification applies only to the destination (either internal or
external). For off-ECS destinations, the answer event at the far end can be
determined either by the call classifier or the network answer supervision.
A call is considered answered if one of the following occurs (whichever is first):
■ Network Answer Supervision — The network provides answer
notification to the ECS (for trunks supporting answer supervision). For
outbound calls over ISDN-PRI facilities, the CONNect message is
interpreted as “far end answered the call.” If Answering Machine Detection
(AMD) has been requested for the call but the parameter “Call
Classification After Answer Supervision” has not been enabled on the
Feature-Related System Parameters form, then the Network Answer
Supervision (non-ISDN-facilities) and the CONNECT message (ISDN
facilities) are ignored. For these cases, the call classifier determines
whether a call has been answered, depending on the AMD treatment
requested for the call.
If the outbound call goes over ISDN-PRI facilities and remains in the ISDN
network (for example, end-to-end ISDN) and answering machine detection
is not requested, then upon receipt of the ISDN CONNect message, the
call is classified as answered and the call classifier is disconnected.
However, if the call goes out of the ISDN network (for example, the call
interworks), the ISDN CONNect message is not sufficient to determine
answer classification. In this case, the call classifier determines the
outcome of the call, just as it does in the non-ISDN case.
If the parameter “Call Classification After Answer Supervision” is enabled
on the Feature-Related System Parameters form, then the ECS will wait for
answer supervision from the network before attaching a call classifier port
to the call in order to detect answering machine or modem tone. However,
Table 4-2. Detected SITs
SIT Name Cause Value Reported
SIT Reorder CS0/42 Network Equipment Congestion
SIT No Circuit CS0/34 No Circuit or Channel Available
SIT Intercept CS0/22 Number Changed
SIT Vacant Code CS0/01 Unassigned Number
SIT Ineffective Other CS0/28 Invalid Number/Domain
SIT Unknown CS0/31 Normal Unspecified
AMD Treatment CS3/24 Answering Machine Detected