Linksys SPA-841 Cisco SPA9000 Voice System Administration Guide - Page 167
Advanced Topics in SPA9000 Administration, Technology Background
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A Advanced Topics in SPA9000 Administration This appendix provides more detailed technical information for administrators who want to understand how the SPA9000 Voice System works. • "Technology Background," on page165 • "SPA9000 Architecture," on page170 • "SIP-NAT Interoperation," on page172 • "Advanced Call Control and Routing," on page173 • "Configuring Vertical (Supplementary) Service Codes," on page173 • "Advanced Topics for SPA400 Voice Mail Service," on page178 • "Remote Provisioning Features," on page183 Technology Background This section provides background information about the technology and protocols used by the SPA9000 system. It includes the following topics: • "Session Initiation Protocol," on page166 • "SPA9000 Media Proxy," on page167 • "Using the SPA9000 with a Firewall or Router," on page168 • "SPA400 SIP-PSTN Gateway," on page169 SPA9000 Voice System Administration Guide 165