![]() ![]() How long is the default keepalive period for Srst in Cisco IOS? Subsequently, question is, what is Call Manager fallback? MGCP fallback enables a gateway to act as local call control when the CUCM server to which the remote site phones and gateway register is offline or WAN connectivity is lost (in which case, Cisco Unified SRST kicks in and offers call control functionality). ![]() The Cisco Unified SRST gateway detects newly registered IP Phones, queries these IP Phones for their configuration, and then autoconfigures itself. SRST Function of Switchover Signaling When the WAN link fails, the IP Phones lose contact with the central CUCM but then register with the local Cisco Unified SRST gateway. 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.
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