asterisk users - Apr 2006 - Polycom 501 unregistered itself?

I've got two Polycom 501s in an Asterisk 1.2.6/zaptel 1.2.5 with  
Digium connected to POTS.  My legacy key system is still running in  
parallel.

Today my 501 didn't ring on an inbound call, nor could I call out.

sip show peers showed no ip address for my 501. Rebooted the phone  
and it's ok now.

There wasn't anything enlightening in /var/log/asterisk/messages.

Has anyone seen this before?

Bill

On Thursday 27 April 2006 18:35, William M Conlon wrote:
> sip show peers showed no ip address for my 501. Rebooted the phone
> and it's ok now.
Without packet traces (just log UDP/5060 or you'll capture the entire audio 
stream too) you'll never know.

I'm wondering if Asterisk or the IP501 "forgets" to respond to SIP
packets
from time to time and thus loses registration.  I've seen this with a
variety
of SIP phones (UTStarComm F1000G lately) which makes me think that Asterisk 
is doing this, but the phones are also to blame in the sense that they are 
not "agressive" enough to keep trying.

-A.