IP Telephony and Phones

Hi,I'm running the cisco IP Communicator v 8.6.1.0 or I have to say I try running this client. Usually after a few days of operation the client does not work anymore. When invoking the Dialog and clicking any button the Dialog freezes. As soon as thi...

Hi,As per documentation when the Enable cluster-wide Call Park Number/Ranges parameter values is FALSE (default) the Call Park feature is implemented restricted to a specific Unified CM node.However, a CUCM cluster is built with more than one subscri...

We have a customer with SIP trunk between CUCM and ISR 4351 Gateway router connected with PRI's. There was no issues when they were running on 16.12.03s  but when we upgrade IOS on 4351 to 17.03.05 SIP trunk to CUCM started flapping and never stayed ...

Customer needs to migrate from 2951 to isr4431 voice gateway with same configuration.  Please let me know the best practice to migrate the voice gateway and what changes that needs to be made. 

Hello,I ran into a problem that all users on LDAP in Rank 1, I need to move them to a new rank at once.How can I do that?Thanks in advance

HiI have CUCM 12.5 and my CAFor internal purpose, I need to add IP address as SAN on the certificat How can I do it ? 

I have strange issue using MOH, it hear silent with PSTN, eveything good only with internal call but when a call came from the pstn and one of the users put the call on hold it hear silent and sometimes it works randomly.

Anyone help with process to  migrate voicemail box stores from existing unrestricted unity connection version 11.5 to restricted 14.0 version     

Ever since we upgraded to CUCM 12.5.1.14900-63, our Cisco 6941 phones are running 2 hours behind, all our other versions (7821,7841,7962G,6901) are displaying the correct time. All those versions of phones are pointing to 1 NTP Server.