asterisk users - Feb 2004 - Minor Registration Problem With Polycom Soundpoint IP 500

We recently took a few Polycom Soundpoint IP 500 to test out in Asterisk
environment.  So far it has been good.  Call Hold, Transfer, DMTF etc.

However, I do notice every now and then the Polycom fails to register with
Asterisk.  Asterisk console outputs the following:

Feb  3 13:02:32 WARNING[278546]: chan_sip.c:2365 __transmit_response: Unable to
determine sequence number from ''
Feb  3 13:02:34 NOTICE[278546]: chan_sip.c:5125 handle_request: Failed to
authenticate user "DavidLiu"
<sip:DavidLiu@192.168.0.254>;tag=9F67E426-59D92ED7
Feb  3 13:02:36 NOTICE[278546]: chan_sip.c:5125 handle_request: Failed to
authenticate user "DavidLiu"
<sip:DavidLiu@192.168.0.254>;tag=BFDEF35B-1CBC4F2C

in sip.conf:
canreinvite=yes
host=dynamic
canreinvite=yes
dtmfmode=rfc2833
context=sip
port=5060

Usually say after the phone failed to register with Asterisk, I can attempt to
place a call.  It will fail of course.  But then I can try calling again and
usually the call will go through and it will successfully re-register itself
without needing a restart.

What can this be?  Surely Polycom is re-registering every 3600 before Asterisk
times it out.  But Asterisk is just refusing it.

By the way, anyone know whether Asterisk is geared towards RFC3261 or RFC2543? 
I know Asterisk is not a fully SIP Proxy but lets say if a SIP PSTNGW or a SIP
phone is designed under the spec 2543 as suppose to 3261, will it work better or
the same with Asterisk?

David
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