The figure illustrates a multisite deployment that incorporates the following solutions to multisite deployment issues:
- Availability issues are solved by Cisco Unified Survivable Remote Site Telephony (Cisco Unified SRST) and MGCP fallback.
- Quality and bandwidth issues are solved by QoS, CAC, RTPheader compression, and local media resources.
- Dial plan solutions include access and site codes, as well as digit manipulation.
- NAT and security issues are solved by the deployment of Cisco Expressway and a Cisco Unified Border Element.