I assume that it was working ok before and that the phone config is ok on the CM? If so, try connecting it to where another working phone is patched in, thus ruling out any cabling/switch port problems.
If this doesn't work, then you know it's the phone.
Maybe try erasing the local config and restoring the phone back to factory defaults, and then see.
I have also seen this problem when I get a dhcp conflict. If you clear ip dhcp conflict * on the router handing the ip address it might clear this up. Also I find that if I test the cable on some of these that are doing this I find pins 4 and 5 bad. Do not know why this would affect the phone since I do not use inline power but when I re crimp the ends it works. These are the two things that I have found to work everytime.
SIP traces provide key information in troubleshooting SIP Trunks, SIP
endpoints and other SIP related issues. Even though these traces are in
clear text, these texts can be gibberish unless you understand fully
what they mean. This document attempts to br...
Please find the attached HTML document, download and open it on your PC.
This provides an easy to use form where you simply answer a few
questions and it will render the proper jabber-config.xml file for you
to copy/paste. There is built in logic to verif...
CUCM Database Replication is an area in which Cisco customers and
partners have asked for more in-depth training in being able to properly
assess a replication problem and potentially resolve an issue without
involving TAC. This document discusses the bas...