troubleshooting Question

CUCM - Able to get "IP Communicator" working, not able to get real phone (7960) registered.

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usslindstromFlag for Japan asked on
NetworkingVoice Over IPIP Telephony
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In a pure lab environment, and following these very simple instructions (, I have been able to get two soft-phones to work just fine.  Both "IP Communicator" phones connect to the CUCM box without any problems what-so-ever.

Unfortunately, my physical 7960 phones aren't having the same luck.  For some reason, they role through the following cycle:

"Requesting Configuration"
"Configuring CM List"

And after about a minute or two - they eventually just give-up and check back in with their CME.  *In my lab, I have a 2800 CME that the phones were all registered to.  The CUCM doesn't say anything about rejecting the phone or anything, only that the phone's status is "unknown".  Both the "IP Communicator" software are in the same network, and I'm feeding the TFTP option to them both via my DHCP server.

At this point, I'm leaning to the phones having too old of a firmware revision on them which makes it so the CUCM box can't service them, but I'm not sure.  If anybody has any experience at all with this, I would very much appreciate your insight.

*In testing, I've tried using both protocols (SCCP and SIP) for the 7960s, but each attempt has let me down at the same spot.
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