All IP Phones are running sccp and the UC520 is using the following firmware:
(UC500-ADVIPSERVICESK9-M), Version 12.4(11)XW6
I've now upgraded it to uc500-advipservicesk9-mz.124-11.XW9 and awaiting the customer so I can reboot the UC and see if we have different results.
To provide more details, when there's an incoming call, the number of the calling party is shown on the IP Phone, but not listed in the call history (missed or answered calls).
One small additional detail which might be important. The 7941 phones installed came from a different installation site where they were running CCME 4.0.1 if I remember correctly and thus their firmware might have been upgraded back then;
I've also got one of these 7941 phones in my lab, running on a 1760 with CCME 4.0 and I'm experiencing the same problem!
Do you beleive it might be an issue with the firmware loaded on the phones ?
I have run into this issue before, and it was a firmware problem. I had to do create-cnf files to make the config files look the newest for the CME, and then get the UC520 to load them with the firmware it wanted to have on them, and the problem was resolved. Hopefully this will assist it your situation as well.
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