Cisco IT supports more than 300 remote sites in approximately 100 countries. Some of these sites are campus sites, but most are remote branch offices. This best practices document describes Cisco IT Survivable Remote Site Telephony (SRST) deployments for single- or dual-router remote offices. The design includes standards for all deployment models as outlined in the centralized call-processing architecture. These best practices also summarize the base standard configuration for the platform and outline different solutions depending on the number of devices to be supported in SRST mode.

Also included in this document:

  • SRST component considerations
  • SRST implementation and operational considerations