IP Telephony and Phones

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Hi,   Apologies for this question, I'm very new to Cisco and IP Telephony as a whole!   I have a 8861 I want to upgrade the firmware on. Currently its on 11 and I want to upgrade to 12. I want to do this using a TFTP server. I can't find anywhere on ...

I am working on CUCM 10.5 version where facing issue with the Extension Mobility feature...unable to see Extension mobility service in Device of Device profile Subscribe/Unsubscribe1. "Cisco Extension Mobility" service is Activated in CUCM serviceabi...

Hello, Has anyone or can anyone point me to links regarding Out of Band DTMF?Our current setup is: ISDN -> Voice Gateway -> H323 -> CUCM The goal is when customers calling in via ISDN enter digits, the DTMF must be transparent from our CUCM and the a...