Trunk group

Last Updated : Feb 24, 2021 |
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In Communication Manager, the number of trunk members that can be administered on a SIP trunk group is increased to 9,999 from a current value of 255. This allows for fewer trunk groups to be administered on a route pattern. More than 255 trunk members can be administered if Member Assignment field is set to ‘auto’. Pages for members are not shown on a SIP trunk group form. Only 1500 members can be added or removed simultaneously on a trunk group.
The following are applicable for Trunk calls and not to SIP station calls:
  • Network Region field on the Route Pattern screen applies only for trunk and OPTIM such as EC500 and telecommuter calls but not for SIP station calls.
  • This overrides the Network Region field on the SIP signaling group for the above-mentioned applicable calls.
Session Manager from the SIP cluster is selected in a round-robin fashion to route the call. It is assumed that any Session Manager on the cluster can route the call to the intended far-end. On receiving a LAR triggering response, another Session Manager from the cluster is selected to route the call. Up to 5 attempts (to unique Session Managers) are made to route the call using the same trunk group and member. On failure of all 5 attempts, the next entry in the route pattern can be used to route the call if LAR is enabled.