[Freeswitch + Avaya 4610] Call dropped after 30 seconds, what could be the problem?

Question

FreeSWITCH

Hello.
Description of software and hardware:
PBX - Freeswitch on Windows XP (Linux is not an option)
Phones - Avaya 4610SW IP + 1 Panasonic KX-HDV130RU white phone
Description of the situation:
PBX works fine - softphones on PC work without problems, installed Panasonic works the same way without any complaints.
Installed Avaya 4610SW IP in SIP mode. For this, we used this guide . In addition, I found a link to other firmware files here .
Just in case, I checked what they write on Freeswitch about 4610, I found this article .
Thus, everything should have started without any problems. In the test version, on one Avaya 4610, I inserted the recommended line in the profile, but not in the second one. Example:

<include>
  <user id="1000">
    <params>
      <param name="password" value="$${default_password}"/>
      <param name="vm-password" value="1000"/>
    <param name="send-message-query-on-register" value="false" />
    </params>
    <variables>
      <variable name="toll_allow" value="domestic,international,local"/>
      <variable name="accountcode" value="1000"/>
      <variable name="user_context" value="office2"/>
      <variable name="effective_caller_id_name" value="Регистратура"/>
      <variable name="effective_caller_id_number" value="1000"/>
      <variable name="outbound_caller_id_name" value="$${outbound_caller_name}"/>
      <variable name="outbound_caller_id_number" value="$${outbound_caller_id}"/>
      <variable name="callgroup" value="registry"/>
    </variables>
  </user>
</include>

There was a difficulty with the lack of wires (lost in the warehouse) - I re-compressed the twisted pair cable under Avaya.
The test run went without problems - the phones are booting up, updating the firmware, registering. In test mode, they call - incoming / outgoing / local / external - all without any difficulties or problems.
Problems began when trying to "combat" use. Roughly speaking, after 30 seconds of conversation, the connection breaks. The period varies from 31 to 43 seconds, and on the same phone. Presence or absence

<param name="send-message-query-on-register" value="false" />

It does not play a role, similarly, the type of call does not affect - local / external / incoming / outgoing.
What could be the problem?

Answer 1

in the sofia profile that Avaya is looking at
<param name="enable-timer" value="false"/>