A
SPA9000 Voice System Administration Guide 165
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
