Registration Failed; "chan_sip.c Line 5216 (handle_requ

[artherd]

This is lovely. I was able to get the SPA_3102 to register ONCE, then I rebooted it (not making any configuration changes) and now get the following message in asterisk:

*CLI> NOTICE[25269248]: File chan_sip.c, Line 5216 (handle_request): Registration from 'EXTENTION 2001 <sip:EXT2001@192.168.0.67>' failed for '192.168.0.30'

I looked up that code, and it's just a strcat. WTF kind of error is this?!
Source:http://www.asterisk.org/doxygen/chan__sip_8c.html

05214       /* If we have only digits, add ;user=phone to the uri */
05215       if (onlydigits)
05216          strcpy(urioptions, ";user=phone");
05217    }