Avaya Communication Manager Administrator's Manual page 1297

busy
This signal is sent to indicate that the called party is busy. On DID calls, the signal is sent to the
CO if there is no coverage point to terminate the call. If Communication Manager receives this
signal on DOD calls, it plays busy tone to the calling party and drops the trunk.
congestion
This signal is sent to indicate that the system is congested and the call cannot be terminated
successfully. On DID calls, the signal is sent to the CO to indicate that a resource is not
available. On DOD calls, if Communication Manager receives this signal, reorder tone is played
to the calling party and the trunk is dropped.
free
This signal indicates that the called party is idle. On DID calls, the signal is sent to the CO to
indicate that the called party is idle and the call is terminated successfully. If Communication
Manager receives this signal on DOD calls, it connects the trunk to the calling party.
intercept
This signal indicates that the called party number is not in service or is not correct. On DID calls,
if intercept treatment is set to provide a tone, tone is sent to the CO to indicate that the called
number is not valid. If Communication Manager receives the signal on DOD calls, it plays
intercept tone to the calling party and drops the trunk.
mct
This signal identifies the call as one that needs to be traced by the CO. Avaya Communication
Manager then generates an MFC Call Trace Backward Signal (administered on the
Multifrequency-Signaling-Related System-Parameters screen) during call setup instead of
the "free" signal. If the terminating station's COR has this feature set to y, the CO collects trace
information before releasing the calling party.
Note:
If the station's COR has MF Incoming Call Trace set to y and the "mct" signal is
Note:
not defined, then the "free" signal is sent.
tariff-free
This signal is sent when the trunk group provides an "800" service. Avaya Communication
Manager generates an MFC tariff-free backward signal (administered on the
System-Parameters Multifrequency-Signaling screen) during call setup instead of the "free"
signal, facilitating CO billing.
Note:
If the trunk is administered as a tariff-free trunk and the "tariff-free" signal is not
Note:
defined, then the "free" signal is sent.
Multifrequency-Signaling-Related Parameters
Issue 1 June 2005 1297