Avaya Communication Manager Administrator's Manual page 1379

Interworking Message
Appears when the Group Type field is atm, h.323, or sip. This field determines what message
Communication Manager sends when an incoming ISDN trunk call interworks (is routed over a
non-ISDN trunk group).
Valid entries
PROGress
ALERTing
IP Audio Hairpinning
Appears when the Group Type field is h.323 or sip. The IP Audio Hairpinning field entry
allows the option for H.323 and SIP-enabled endpoints to be connected through the IP circuit
pack in the media server or switch, without going through the time division multiplexing (TDM)
bus.
Valid entries
y/n
IP Video
Appears only for signaling group type h.323.
Valid entries
y/n
Usage
Normally select this value. PROGress asks the public
network to cut through the B-channel and let the caller
hear tones such as ringback or busy tone provided over
the non-ISDN trunk.
ALERTing causes the public network in many countries
to play ringback tone to the caller. Select this value only
if the DS1 is connected to the public network, and it is
determined that callers hear silence (rather than
ringback or busy tone) when a call incoming over the
DS1 interworks to a non-ISDN trunk.
Usage
Type y to enable hairpinning for H.323 or SIP trunk
groups
Usage
Enter y to indicate that this signaling group has IP
video capability.
Signaling Group
Issue 1 June 2005 1379