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Implementing Cisco Unified Communications Manager, Part 2 (CCNP Voice): Examining Remote-Site Redundancy Options

Chapter Description

This chapter provides an overview of the different options with remote-site redundancy in CUCM multisite installations. These different mechanisms are illustrated to help you understand how the technologies interact to deliver reliable communication services. This includes Media Gateway Control Protocol (MGCP) and Cisco Unified Survivable Remote Site Telephony (SRST).

Summary

The following key points were discussed in this chapter:

  • MGCP fallback works in conjunction with SRST to provide telephony service to remote IP Phones during WAN failure.
  • Making the Cisco IP Phone CUCM list shorter results in faster SRST switchover.
  • The Cisco Unified SRST version is linked with the Cisco IOS Software release.
  • The MGCP gateway fallback default application is H.323 or SIP.
  • When SRST is active, several measures must be taken to ensure connectivity from remote sites to PSTN destinations, between different sites, and inside the site itself.
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