DCS with reroute might accomplish what you need to do. It releases unecessary trunks on transfered calls. Check the Communication Manual for a better detail of this feature also to see if it is activated.
DCS with Rerouting
DCS with Rerouting allows a call
’s connection between two Avaya switches to be
replaced by a new connection. All of the trunks used in the original path must be
DCS+ (DCS over PRI) and the new path utilizes only DCS+ trunks. DCS with
Rerouting provides the following capabilities:
—
Attempts to obtain a better (generally less expensive) connection.
—
May replace the current path of a call with a route that is better in terms of
Automatic Alternate Routing/Automatic Route Selection (AAR/ARS) routing
preferences administered on an Avaya switch.
—
Frees up resources being used unnecessarily.
DCS with Rerouting must be enabled on a switch-wide basis and the trunk groups
involved must be administered as SSE. DCS with Rerouting primarily provides
you with the ability to be more effective with the usage of Trunk groups
administered for Supplementary Services Protocol Option E (SSE) during the
existence of an active call. This means using a preferred route (in terms of
UDP/AAR/ARS routing preferences administered on the switch) between the
switches involved.