[Freeswitch-users] end call detect on FXO port

[Brian May]

Hello,

I need to get Freeswitch to detect when the caller has hang up, so it
will hang up the ilne also. Especially important for when the caller
has left a message, although ideally it should work for all calls.

With Asterisk this required the use of automatically detecting the
busy signal, at the driver level. How can I do something similar with
Freeswitch?

Some web pages suggest I use this:

<action application="tone_detect" data="busy 425 r 0 hangup
'normal_clearing' 3"/>

Unfortunately this has the side affect that it answers the call, I
don't want to change the answer behaviour,
only the hang up behaviour.

2010-02-27 14:27:52.655081 [DEBUG] switch_core_session.c:1728
Application tone_detect Requires media! pre_answering channel
OpenZAP/3:1/0397551926

I also see this message, but so far no solution:

http://lists.freeswitch.org/pipermail/freeswitch-users/2008-July/004567.html

How do I do this?

Thanks
-- 
Brian May <brian at microcomaustralia.com.au>