[Freeswitch-users] session timer - enable/disable per call

Is it possible to either: a) enable/disable the session timer per call, via the dialplan? b) change the session timeout value per call, via the dialplan? Currently, it's set in the sofia profile, either: <param name="enable-timer" value="false"/> or <param name="session-timeout" value="xxx"/> However, it would be great if it could be changed/set per call. If you ask why, a particular device when it receives a re-invite mid-call decides to re-invite an already established T.38 call to PCMU which breaks the FAX transmission. Yes, this is a long fax :) Unfortunately, the vendor won't fix, so it'd be nice for these devices to be able to simply disable or set the timer to a really long time in the dialplan. Thanks ...