Cisco Linksys SPA9000 - Manual (Page 3)

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Linksys SPA9000 Administrator Guide
Document Version 3.01
C O N T E N T S
Preface i-xi
Document Audience i-xi
How This Document is Organized i-xii
Document Conventions i-xii
Related Documentation i-xiii
Technical Support i-xiii
C H A P T E R
1
Using the Linksys Voice System 1-1
The Linksys Voice System 1-1
Overview 1-1
SPA400 SIP-PSTN Gateway and Voicemail 1-2
Auto-Attendant 1-3
SPA9000 System Features 1-3
Additional Features When Used with SPA900 Series IP Phones 1-5
Technology Background 1-6
Session Initiation Protocol 1-6
SPA9000 Media Proxy 1-7
Using the SPA9000 with a Firewall or Router 1-8
SPA400 SIP-PSTN Gateway 1-8
Network Address Translation (NAT) 1-9
NAT Overview 1-9
NAT Types 1-10
Simple Traversal of UDP Through NAT 1-10
SIP-NAT Interoperation 1-11
SPA9000 Architecture 1-11
Architectural Components 1-12
Multicast Addressing and Group Paging 1-13
Configuration Options 1-14
Interactive Voice Response 1-14
Setup Wizard 1-14
Administration Web Server 1-14
Local Client Configuration and Registration 1-15