The SIP Signaling Group (SIP-SGRP) MO supports a signaling channel (D-channel) for SIP trunk connections. The G4xx Media Gateways and Avaya Aura® Media Server provide audio connectivity, working in concert with a PROCR which provides control signaling to support a SIP connection.

The SIP signaling group (SIP-SGRP) is a signaling channel that physically resides on a IP-PROCR and the IP network. Unlike ISDN D-channels, the SIP channel may actually come up and down on a call by call basis. The SIP channel is actually a TCP/IP signaling channel. Layers 1 and 2 of this signaling channel are monitored by IP PING testing.