I seem to recall this issue mentioned on asterisk-dev.  Check issues.digium.com 
and see if there is anything similar to your issue.

> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of
> Cassius Smith
> Sent: Friday, May 06, 2011 11:23 AM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: [asterisk-users] Asterisk 1.6.2.18, Cisco 79XX not
> registering
>
> Hi all,
> I have a production server running with about 90 Cisco
> 79[46]1's and SIP release 8.5(2)SR1 from last year. I was
> running Asterisk 1.6.2.9 and upgraded last night after hours.
> (Seemed low risk to me!)
>
> Much to my surprise, not a single one of the Cisco 79XX
> phones would register. Since it's a production server, I
> rolled back to 1.6.2.9 and everything was fine. All my
> Linksys SPA phones and Polycom speaker phones registered just fine.
>
> I am now setting up  test servers with both 1.6.2.18 and
> 1.8.3.3 to collect some debug.
>
> I am just curious - has anyone else had SIP issues with these
> phones and updating Asterisk broke them?
>
> I will post results of my findings after I have time to collect them.
>
> Cassius Smitha
>

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