[Freeswitch-users] Detect answer on FXO device

[Cristian Re]

I have a Grandstream GXW4108 device, connected to a PSTN line and I use 
it to make outbound calls via freeswitch.
The problem I have is that this device sends SIP 200/OK message 
immediatly after freeswitch INVITE.
There is a way to configure freeswitch to detect the answer (with voice 
detetection?) and propagate the 200/OK message only on answered calls?

Thanks
Cristian