Which two steps are required to enable MGCP Gateway Fallback?

Enable MGCP Gateway Fallback using the ccm-manager fallback-mgcp command, and set the alternate application to default.

Which device initiates SRST?

The SRST process is initiated by the IP phone sending a registration request to the SRST gateway.

Which gateway protocol can provide call preservation when using ISDN to the PSTN?

H.323 can provide call preservation when using ISDN to the PSTN.

Which command supports both extension addressing and E.164 addressing?

dialplan-pattern supports both extension addressing and E.164 addressing.

Which two SIP functions does a gateway perform to enable SIP SRST?

A gateways performs SIP Registrar Server and B2BUA to enable SIP SRST. Version 3.0 used Redirect Server instead of B2BUA.

Which certificate server can a Secure SRST router autoenroll with?

A Secure SRST router can autoenroll with Cisco IOS certificate server.

Which gateway protocol should you use for a remote site with an E1 PRI to provide the best call preservation?

You should use H.323 for a remote site with an E1 PRI to provide the best call preservation.

What is required to support integration to a centralized voice-mail system over a PRI?

The service provider must pass RDNIS. It might also be possible to support RDNIS using the forward-digits extra inband command on the dial peer if the router is running Cisco IOS 12.3(11)T or later.