check the line supervision signalling of your GSM and the GXW4104. there are several disconnect signalling used: current disconnect, polarity reversal or busy tones. your FXO port must be set accordingly.

On Fri, Apr 13, 2012 at 3:09 PM, ocset <ocset@the800group.com> wrote:
Hi

I have successfully managed to get FreeSwitch to bridge an incoming call
on a PSTN line to an external mobile phone using a second PSTN line with
the help of a GXW4104 FSO gateway.

I am now having a serious issue where the call never gets terminated
when the parties hang up. The only way to end the call is to either
shut-down FreeSwitch or turn off the GXW4104. If I bridge the call to a
SIP gateway (PennyTel) instead of the second PSTN line, then it works as
expected when both parties hang up.

Here is what I have tested

1. Call -> PSTN line1 (GXW4140) -> PennyTel SIP gateway -> external
mobile phone -- call end when both parties hang up.
2. Call -> PSTN line1 (GXW4104) ->  PSTN line2 (GXW4104) -> external
mobile phone -- call never end, even when both parties hang up.

Is there a parameter I should be setting to help solve this issue or
some code that I should implement to test for this situation?

I have also noticed that with test scenario 1 (PSTN line + SIP Gateway),
if the person being called does not end the call on their side, then
that leg of the bridge remains active.

ps. The second PSTN line is not a real copper line. It is a PennyTel
VOIP line that is managed by the modem and connected to the GXW4104 via
phone cable. So, as far as the GXW4104 is concerned, it is just another
POTS line. I don't have a second PSTN phone line so can't test any other
way.

Thanks in advance
O.

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