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This chapter is from the book


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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