Grp No

The signaling group number

Group Type

The type of signal format (ISDN-PRI, , H.323, SIP)

Max NCA TSCs

Maximum number of Non-Call Associated (NCA) Temporary Signaling Connections (TSCs) - virtual connections established within a D-Channel in the facility so that users can transport non-call control user-user information.

Max CA TSCs

Maximum number of Call Associated (CA) TSCs.

Remote Office

The number of NCA TSCs that are administered.

Trunk Group for NCA TSC

The ISDN-PRI trunk group number whose incoming call-handling table handles incoming NCA-TSCs through this signaling group

Trunk Group for Channel Selection

If more than one trunk group is assigned to this signaling group, this trunk group is the one that can accept incoming calls

TSC Supplementary Service Protocol

This field is displayed when trunk Group Type is ISDN, and for signaling group types , H.323, and ISDN-PRI.

a = AT&T Customer Supplementary Services when Country Code is 1A on the DS1 screen.

a = Bellcore Supplementary Services when Country Code is 1B on the DS1 screen

a = Nortel Proprietary Supplementary Services when Country Code is 1C on the DS1 screen.

b = ISO Q SIT

c = ETSI. Use to support ETSI-ISDN Completion of Calls (Auto Callback) functionality.

d = ECMA QSIG

e allows DCS with rerouting, when DCS with Rerouting is y, and Used for DCS on the trunk group screen is y.

f = Feature Plus

g = ANSI.

T303 Timer (sec)

The number of seconds the system waits for a response from the far end before invoking Look Ahead Routing. Displayed when the Group Type field is isdn-pri on the DS1 Media Module screen or h.323 on the Signaling Group screen.

Near-end Node Name

The node name for the Procor interface on this switch, administered on the Node Names screen and the IP Interfaces screen.

Far-end Node Name

The node name for the far-end Procor interface used for trunks assigned to this signaling group, administered on the Node Names screen.

Near-end Listen Port

A port number assigned to both near-end and far-end systems for signaling. 1719 is used when LRQ is y.

Far-end Listen Port

The same port number assigned to the near-end listen port.

Far-end Network Region

The network region number that is assigned to the far-end of the trunk group. It is displayed only for H.323 signaling groups. A blank indicates the region of the near-end node

LRQ Required

n when the far-end PBX uses a Communication Manager server

y when the far-end PBX uses a server that is not a Communication Manager server, and requires a location request to obtain a signaling address in its signaling protocol

RRQ Required

y when the signaling group serves a remote office (gateway)

n when the signaling group serves a gatekeeper

Calls Share IP Signaling Connection

y = inter-Communication Manager server connections

n = the local and/or remote PBX uses a non-Avaya server.

Bypass if IP Threshold Exceeded?

y = the system automatically removes from service trunks assigned to this signaling group, when IP transport performance falls below limits administered on the Maintenance-Related System-Parameters screen.

Direct IP-IP Audio Connection

y enables direct audio connections between IP endpoints, and saves on bandwidth resources and improves sound quality of VoIP transmissions.

Interworking Message

Determines what message the switch sends when an incoming ISDN trunk call interworks (is routed over a non-ISDN trunk group).

PROGress causes the public network to cut through the B-channel and enable the caller to hear tones, such as ringback or busy tone, over the non-ISDN trunk.

ALERTing causes the public network in many countries to play ringback tone to the caller. Select this value 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.