Hi -   There is a lot on this topic in this forum - you can do a search.  Also, great information on this in the SRND - look at the dial plan - Calling Privileges in Unified CM section   https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/collab11/collab11/dialplan.html?bookSearch=true    Regards, Les ... View more

Hi Remon -   Take a look at this page to make sure your VM host supports the OVA.   Virtualization for Cisco Virtualized Voice Browser   https://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/uc_system/virtualization/virtualization-cisco-virtualized-voice-browser.html#Notes11.5Med    Also - there are a couple of ES files that should be loaded for 11.5(1) so make sure you do that.  You might also want to just move to 11.6(1).     Regards, Les ... View more

Hi -   They will stay registered to the SRST router as long as needed.  It sounds like all other network services are OK so DHCP and IP address renewal won't be an issue (which might be the time limit you were thinking of).     Regards, Les     ... View more

On the 4K ISR's you'll have to set the dspfarm on the voice-card.  voice-card 0/4  dsp services dspfarm Sh inv = NAME: "PVDM subslot 0/4", DESCR: "PVDM4-256 Voice DSP Module" PID: PVDM4-256         , VID: V02, SN: FOC200831NF ... View more

Hi John - You are correct.  If you take a look at the link I included and scroll down to the 7965 section you will note that the firmware you looking for is included in that device pack.  When you install the device pack you will be upgrading ALL firmware versions to the values notes in the release notes.  If you do not want to upgrade other telephone models you will have to roll back the device defaults to their current values before starting the TFTP servers.  Be aware of that before kicking this install off so you don't accidentally affect end points you are not trying to change. ... View more