Need to disconnect calls with silence in call duration for more than a specified limit.

[Tajamul Maqbool]

Hi Team,

I need to disconnect those calls in which actually no leg is connected but I didn't get hangup for these calls reason can be Telco provider or the sangoma card or anything . Now because I didn't get any hangup from either leg this channel is still occupied by these calls but actually nobody is there on the call. This channel remains to be there until I manually kill this uuid or restart FS. 

Now I want to detect silence in the call and based upon the limit set call should disconnect and channel is free to take more calls.

I have already tried using following:

"rtp_timeout_sec"  :: seems this is available for sip only .

"wait_for_silence"   ::  not useful for me because this only checks silence at a particular time not over the complete duration of the call.

"record_session"   :  here I couldn't find any option for providing a silence threshold .

Set up details :

freswitch version :  1.6

SET up type :  PSTN

CARD    :    Sangoma

Any idea ??