Lucent Technologies 555-230-220 manual Answer Classification, SIT Name

ASAI and Call Control

The following lists the conditions that can be detected:

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

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,

Issue 7 May 1998 4-13