I have a few Polycom 321 and 450 SIP phones which are using a Cisco 800 series ADSL router. They get DHCP from this router. On a few occasions phone have individually unregistered. Rebooting the phone has no affect.
The only thing I have found that gets the phone working again is to clear the DHCP binding on the router then reboot the phone. The DHCP binding is still showing on the router before hand and I can see NAT translations etc on the router.
I've had no problems with other devices using the same router. Has anyone else seen this or have any idea what might be going on?
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