[Freeswitch-users] tone_detect vs. ignore_early_media (per leg?)

[Jeroen C. van Gelderen]

Hi Guys,

I have a legacy Panasonic PBX which does not support CPC/Disconnect
Supervision. Calls from this PBX are sent to Freeswitch by way of
DAHDI/FreeTDM FXO ports (on a Xorcom Astribank). I use tone_detect to deal
with far-end hang-ups. This works fine:

<!-- Detect busy tone from Panasonic -->
<action application="tone_detect" data="busy 350,440 r 0 hangup 4"/>

Some calls from the Panasonic PBX are put in a FIFO and from there they are
sent to a SIP-to-GSM bridge (GoIP) to be terminated on one of 3 GSM phones
in a round-robin fashion.

The GSM bridge requires me to use "ignore_early_media=true" otherwise the
caller will receive messages like "the number you are calling does not
answer". When I set "ignore_early_media=true" the FIFO correctly keeps
hunting for a GSM phone that is actually answered and will ignore phones
that are busy, no-answer or turned off. This too works fine.

The problem occurs when the two are combined as follows:

Panasonic PBX --FXO--> Freeswitch --SIP--> GSM-bridge

If I enable ignore_early_media then tone_detect doesn't work UNTIL one of
the GSMs is answered. This is a problem when none of the GSMs are answered
and the Panasonic PBX hangs up. The FXO port will stay "up" and the FIFO
will keep hunting until it times out.
 
If I don't use "ignore_early_media=true" then tone_detect works fine but
then every telco message gets mistaken for an answered call and the hunting
stops early.

I tried changing this example line from my fifo.conf:

<member timeout="30" simo="1" lag="5">
{member_wait=nowait,ignore_early_media=true}sofia/internal/1??????7701 at 192.1
68.3.11:5060
</member>

to 

<member timeout="30" simo="1" lag="5">
{member_wait=nowait}[ignore_early_media=true]sofia/internal/1??????7701 at 192.
168.3.11:5060
</member>

in a vain attempt to ignore early media on the SIP leg only. This doesn't
seem to do anything however.

Can anyone clue me in on what I'm missing? I've snipped the relevant
configuration bits below. I have the feeling I'm missing something obvious.

Cheers,
-Slim

----8<----8<----8<----8<----8<----

<configuration name="fifo.conf" description="FIFO Configuration">
  <settings>
    <param name="delete-all-outbound-member-on-startup" value="false"/>
  </settings>
  <fifos>
    <fifo name="cool_fifo@$${domain}" importance="0">

      <member timeout="30" simo="1" lag="5">
{member_wait=nowait,ignore_early_media=true}sofia/internal/1??????7701 at 192.1
68.3.11:5060</member>

      <member timeout="30" simo="1" lag="5">
{member_wait=nowait,ignore_early_media=true}sofia/internal/1??????7693 at 192.1
68.3.11:5060</member>

      <member timeout="30" simo="1" lag="5">
{member_wait=nowait,ignore_early_media=true}sofia/internal/1??????7698 at 192.1
68.3.11:5060</member>

    </fifo>
  </fifos>
</configuration>

----8<----8<----8<----8<----8<----

<include>
  <context name="pbx_test">

    <extension name="test1">
      <condition field="${freetdm_span_name}" expression="^span_fxo_test$">
        <action application="answer"/>

        <!-- Detect busy tone from Panasonic -->
        <action application="tone_detect" data="busy 350,440 r 0 hangup 4"/>

        <action application="playback"
data="ivr/ivr-hold_connect_call.wav"/>

        <action application="fifo" data="cool_fifo@$${domain} in"/>

      </condition>
    </extension>
  </context>
</include>

----8<----8<----8<----8<----8<----

Cheers,
-Slim
--
Jeroen C. "Slim" van Gelderen