Cisco Srst

What is SRST mode?

SRST. Survivable Remote Site Telephony (SRST) is a Cisco Unified Communications Manager (CUCM) security mechanism that allows Cisco IP Phones to register with a Cisco router.

How Does Cisco SRST Work?

SRST Transition Reporting Feature If the WAN link fails, the IP phones lose contact with the central CUCM but register with the local Cisco Unified SRST gateway. Cisco Unified SRST Gateway detects new registered IP phones, prompts you to configure those IP phones, and then automatically configures itself.

What is Call Manager Reservation?

In MGCP recovery, a gateway can act as a local call controller if the CUCM server, for example administrative functions).

Also, what is the standard keepalive period for Srst in Cisco IOS?

The default retention period is 30 seconds. If your phone has an active standby connection to a Cisco Unified SRST router, the backup process will take 10-20 seconds after the Cisco Unified CM connection is disconnected.

What is Cisco Retention Mode?

Call Preservation (also known as Call Survival) is a feature that allows you to keep calls active during a CUCM violation using a gateway. Each gateway and trunk configuration device described in this article has a device pool with a call manager group configuration.

What does SRST mean?

Surviving External Telephony

What is Cisco Cube?

Cisco Unified Border Element (CUBE) is a unified communications interface that connects voice and video connections between two separate VoIP networks. It is similar to a traditional voice gateway, except that physical mailboxes are replaced with an IP connection.

What is MGCP recoil?

MGCP fallback is used if a gateway for MGCP is configured in CUCM and CUCM cannot be reached by the gateway. Basically it puts the port into H.323 operation during the power failure. It also makes it easier for you to survive and lose CUCM-related calls.

What are SRST and MGCP backups?

srst = Remote telephony can survive, if the IP phone loses connection to cm, the phone registers itself to the standard gateway. mgcp fallback = set the failover server in the call manager cluster.