To specify group members and supplementary service protocol, make the following entries on the Trunk Groups form:

1. On the Group Member tab, specify the number of signaling groups that have ports that are members of the trunk to the Avaya IR system.

   You may specify:

   • Up to three signaling groups
   • Fewer than the actual number of signaling groups

     When you configure an H.323 trunk connection on DEFINITY or MultiVantage, you need to understand how channels are mapped between the switch and the Avaya IR system. See H.323 trunk configuration guidelines for VoIP for more information.

2. Set Supplementary Service Protocol to b.

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