[asterisk-users] Re: Asterisk hangs up after 10-15 minutes when SIP Phone is on mute

[Tony Mountifield]

In article <00ff01c6d292$c1d6dd20$0a01a8c0 at MIKE>,
Mike <list at virtutel.ca> wrote:
>  
> I have a Polycom 501 connected to Asterisk 1.2.4 (and then connected to a
> VOIP provider, Unlimitel in my case).  My job requires me to attend
> conference calls regularly, and I am usually there as a silent listener.
> Therefore, I mute my phone.
>  
> I`ve noticed that if I mute my phone, after 10-15 of being muted, the line
> hangs up.  I had the same problem with my GXP-2000 before, so I dismissed
> the phone as being the problem.  If I unmute regularly (or the entire time),
> the line doesnt hang up (until it reaches max timeout of course, which is
> much more than 15 minutes).  So the problem is my phone is muted. I have
> observed that about 6 times (out of 6 tries) in the last 4 months.  It`s a
> reccuring issue for sure.

Can you user Ethereal or similar to find out whether the phone stops sending
the RTP stream to Asterisk when it is muted?

Is there any kind of NAT gateway between the phone and Asterisk?

If both of the above are true, it might be possible that the NAT gateway's
session mapping for that stream is timing out.

Or perhaps Asterisk decides to hang up the call if it doesn't get any RTP
for a certain length of time.

Just a couple of ideas to try.

If the phone is still sending RTP when muted, the stream presumably contains
perfect silence. I don't know if that gets detected anywhere.

Cheers
Tony
-- 
Tony Mountifield
Work: tony at softins.co.uk - http://www.softins.co.uk
Play: tony at mountifield.org - http://tony.mountifield.org