Domain/Forest Functional Level to 2012 R2, but it’s always good to proceed with caution. CUCM 10.5 should be LDAP compliant with 2012 R2, but ensure that your LDAP settings are correctly configured post-upgrade.
Based on the '480 Temporarily Not Available' error, it seems there’s a routing issue with the call forwarding back to PSTN. I recommend checking your Voice Gateway translation profile and dial-peer settings to ensure proper routing for PSTN-to-PSTN c...
how the SIP trunk or voice gateway handles call forwarding to PSTN. The "480 Temporarily Not Available" error usually indicates a routing or signaling issue. Try verifying your call forwarding settings on CUCM and ensure that the SIP trunk has the co...
It sounds like there might be a configuration issue or network-related problem. You could try restarting the CUCM server, clearing the phone’s cache, or verifying that the voice VLAN and DHCP settings are correct. Also, check if there’s any firmware ...
