UC 560 phone freezes

[yency]

Hello

I have an UC 560 with 100 Ip phones with 2 T1 lines, and sometimes a couple phones lost communicactions with the UC, and for the phone start working again you need to unplug the phone, We used to have an CCM 4.1 and didn't have this issues, for one reason is the UC could handle that amount of phones.

Thanks

[paolo bevilacqua]

For one you should mention which phone type?

Is that you that have installed and maintaining the syste? Or you have an UC certified Cisco partner do it ?

[yency]

Hello

Thanks for the answer.

The phones are 7940, 7912, 7911, 7910

I made the instalation with a friend are we're ccnp voice

[paolo bevilacqua]

Make sure you running latest firmware , as they should be stable.