Administrator's Guide

Answer detection

Issue 5 October 2002 1469555-233-506

Network answer supervision

The central office sends a signal to the originating switch to indicate that the far

end has answered. If a call traveled over a private network before reaching the

central office, the signal is transmitted back over the private network to the

originating switch. This method is extremely accurate, but it is not available over

most loop-start trunks (for example, central office (CO), foreign exchange (FX)

and Wide Area Telecommunications Service (WATS) trunks in the US).

Network answer supervision does not override answer supervision by timeout.

Answer supervision by timeout

You set a timer for each trunk group, using the Answer Supervision Timeout field

on the Trunk Group screen. Or you set a circuit pack timer for the ports on that

circuit pack, using the Outgoing End of Dial (sec) field on the Trunk Group

screen. If the caller is off-hook when the timer expires, the system assumes that

the outgoing call has been answered. This is the least accurate method. Calls that

are shorter than the timer duration do not generate call records, and calls that ring

for a long time produce call records whether they are answered.

If network answer supervision is received, it overrides answer supervision by

timeout.

Interactions

■ Call Detail Recording

Answer Detection provides more accurate call records where tone

detection is possible and Network Answer Supervision is not received.

■ Call Prompting

Call classification competes with Call Prompting for ports on the call

classifier circuit pack.

■ CallVisor ASAI

Call classification competes with CallVisor ASAI switch-classified calls

for ports on the call classifier circuit pack. Answer Detection triggers

reporting of a connect event to ASAI.