[Freeswitch-users] fs doesn't realize caller hanged up when a call from PSTN is on hold

Gonzalo Servat gservat at gmail.com
Wed Jan 7 18:14:40 PST 2009

On Wed, Jan 7, 2009 at 6:39 PM, tester tato <testeador01 at gmail.com> wrote:

> Hello everyone,
> Thanks in advance if anyone wants to help me in a couple of questions; I
> set up my fs plant and included a grandstream fxo gateway gxw4104, the
> gateway redirects all incomming calls from the PSTN to the extension 1005
> (with its default sample configuration).
> This is what happens:
>    1. I get a call from the PSTN, pick it up and i decide to put it on hold
> while i do something else, the caller hears the moh.
>    2. If the caller gets tired or bored of waiting and hangs up, my FS
> plant doesnt realize that the caller hung up, so the channel stays busy, so
> does the gateway line and my phone still acts as if i had a call on hold.
>    3. When i pick up the phonecall that was on hold all i hear (obviously)
> is the busy tone from the PSTN.
> My questions are:
> Is this behavior only from this particular gateway? or does it happen with
> other FXO devices.
> Is there a way to specify that i want the call to hang up itself when the
> caller hangs up so the channel gets released?
> I know that the call actually gets hanged up and realeases the channel if
> the caller was another SIP extension on my plant, it just doesn't work with
> calls from the pstn under my configuration.
> I highly appreciate any light you can throw to me on this matter.

You might need to use
See the example at the bottom (this is how I use it to detect a hang up as
my telco doesn't vary the voltage levels on hangup)

- Gonzalo
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