Voice Register Global Mode Srst

: While SRST provides a reduced feature set compared to CUCM, it maintains core telephony functions like hold, transfer, and conferencing.

When a SIP phone is registered to CUCM, it has the SRST reference IP address configured in its device settings (typically the branch router's IP). voice register global mode srst

Unlike SCCP phones, which register using TCP on port 2000, SIP phones use UDP (typically) on port 5060. The call-manager-fallback service does not natively handle SIP registration logic. The voice register global container is the dedicated engine for SIP provisioning and registration handling. : While SRST provides a reduced feature set