Avaya Communication Manager Administrator's Manual page 1420

Screen Reference
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 Enablement Services (SES)-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
1420 Administrator Guide for Avaya Communication Manager
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 SES trunk groups. Default is n.
Usage
Enter y to indicate that this signaling group has IP video capability.