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ASAI and Call Control
4-12 Issue 7 May 1998
Call Classification
The ECS uses the Call Classification process, along with a variety of internal and
external events, to determine a Switch-Classified call’s outcome. If Call
Classification after Answer Supervision is disabled, then whenever the called
endpoint is external, a call classifier is used.
The classifier is inserted in the connection as soon as all the digits have been
outpulsed.
The Global Call Classification can be administered by setting the USA Default
Algorithm field to ‘n’ on the system Parameters OCM Call Classification form.
Global Call Classification uses the TN744D (or later) and TN 2182B (or later) call
classifiers.
If Call Classification after Answer Supervision is enabled, the ECS will not use a
call classifier and will instead only rely on network answer supervision to
determine whether the call is answered. If Answer Machine Detection is
requested for the call, the ECS will attach a call classifier after answer supervision
has been received.
A call is classified as either “answered” or “dropped” (Third Party Call Ended).
Ringing is reported to the adjunct as an Alerting Event Report, but in and of itself
is not a final classification. “Non-classifiable energy” is always treated as an
answer classification and reported to the adjunct as such. The modem’s answer
back tone results in a Third Party Call Ended. The SIT detection is reported to the
adjunct as an Answered Event Report or Third Party Call Ended depending on the
customer’s administration preference. Answering Machine Detection (AMD) is
reported as answered or call ended, depending on administration or call options.
Starting with G3V4, the accuracy of SIT tone detection has been improved by
interpreting the cause value for SIT tones that the network sends in the ISDN
PROGress messages. If no SIT tone related cause value is included in a
PROGress message, then the classifier is used to detect the SIT tone. See the
“change SIT Treatment” form in the
DEFINITY Enterprise Communications Server
Implementation,
555-230-302, to administer SIT reporting to the adjunct.