[Freeswitch-users] ftmod_libPRI outgoing calls channel selection

[Michal Zubáč]

Hi.

I've noticed that outgoing call channels in freetdm/ftmod_libpri are not 
selected exclusively in Q.931 SETUP messages. Channel identification 
"exclusive" bit is 0 so it only means "preferred".
In some cases freeswitch selected channel which was not ready for 
dialing yet and ISDN operator answered with another channel in PROGRESS 
message. So actual call state messages were passed trough another 
channel and it resulted with lots of VETO and consecutive RESET 
messages, because of channel state confusion in FreeSwitch.

I think that it's better to force channel selection and in some cases 
choose wrong channel and get info about it. It's definitely better, then 
choose something, assume that it is correct although actual 
communication is done on another channel and such calls are "doomed"...

I've attached patch, in which we force selection of ISDN channel. Maybe 
better solution will be some configuration variable, which will control 
this behaviour. Consider.

Does anybody have similar experience and if so, how do you deal with it? 
Or am I mistaken in some of my conclusions?

-- 
Michal Zubac
ComGate Interactive s.r.o.

Prague Marina Office Center
Jankovcova 1596/14a
17000 Praha 7, Czech Republic

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