I think DMS100/250/500 can all support this capability -- for both ISUP and PRI interfaces. They refer to it as the RLT feature. I would be interested in hearing how the carriers you deal with charge for this service.
Will do.
Extract from DMS250 feature list:
Release Link Trunk (RLT) enables you to optimize trunk facilities by releasing PRI circuits after call bridging or redirection occurs.
Without
the use of RLT, calls that are extended to an enhanced services platform and subsequently bridged to a third party would need to be maintained, tying up additional resources. PRI RLT allows bridging or redirection to take place at the DMS-250 system so that corresponding circuits to the enhanced services platform can be released.
Thanks for the info! -MC