Does SNR work to internal phone numbers? I am just trying to set up a test with another extension as the remote destination but it never rings. All external numbers work fine. From the SRND:
"A remote destination represents a single PSTN phone number where a user can be reached."
Does the remote destination have to be a PSTN number?
If you'd like to test it without involving PSTN you may set up another CUCM and create an Inter-Cluster trunk. You may use the IP phone on the other cluster as "remote destination".
It was documented in SRND:
Remote destinations must be Time Division Multiplex (TDM) devices or off-system IP phones on other clusters or systems. You cannot configure IP phones within the same Unified CM cluster as remote destinations.