Enter the certificate provider (credentials service) port number. Check the box asking if the SRST gateway is secure. Enter the name of the SRST gateway, the IP address, and the port. The following figure shows the available fields in the SRST Reference Configuration window. How do I configure the SRST reference configuration window? The only step needed is to configure the CME/SRST feature and accept the EULA. No additional licenses need to be installed on the router. With only the uck9 package installed, the cme-srst license is not in an active state. Do I need to install CME/SRST on my router? Once the last command is entered, you’ll be prompted to accept the EULA. Issue the max-dn and max-ephone commands. It will cover how to activate the CME/SRST feature license. How to activate the CME/SRST feature license? “CM Fallback Service Operating” to inform users fallback mode is active. When the IP phone is in fall back mode the prompt on the phone displays the message. SRST only provides basic survivability for remote sites in the event of a WAN outage. Survivable Remote Site Telephony (SRST) is a Cisco Unified Communications Manager (CUCM) call processing backup mechanism that allows Cisco IP phones to register to a Cisco router. When CUCME provides Cisco Unified SRST functionality, provisioning of phones is automatic. SRST is an IOS feature that enables routers to provide call-handling support for Cisco IP Phones if they lose their connection to a remote Primary CUCM which can occur if the WAN connection to the main site is down.
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