This was discussed on the list not long ago.  Essentially it's a FreeSWITCH 
session timeout because the phone isn't sending any media to FreeSWITCH. AFAIK 
it doesn't affect any calling.

Josh Patten
Brazos County Network Engineer
979.361.4676

From: [email protected] 
[mailto:[email protected]] On Behalf Of Michael Scheidell
Sent: Tuesday, April 12, 2011 10:06 AM
To: [email protected] users
Subject: [sipx-users] moh for only 5 mins?

I know there are/were some things that firewalls, and/or itsp's do at (almost ) 
exactly 600 seconds.

I am trying to track down why a held call will lost moh at exactly 600 seconds.

dialing out of a 4.20 system, using level3 els trunks (separate sip signaling 
and media servers), using internal sipx bridge.

phone is polycom 650, fw 3.13.

i make an outbound call to my cell, and put it on hold, set mute buttons, 
listen to my nice moh.

600 second later, abruptly, no moh. and if I take call off of hold, I get two 
way audio.

I do see sipx sending another invite to the itsp, and they send sdp: 200 ok, 
ack it, then sipx sends another invite, and I see several more sdp 200ok's from 
them along with another invite.

yes, I can do packet traces.

any ideas till then?

--
Michael Scheidell, CTO
o: 561-999-5000
d: 561-948-2259
ISN: 1259*1300
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