Linksys SPA1001

iii
Linksys ATA Administrator Guide
Document Version 3.1
CONTENTS
Preface
Document Audience
i-xi
Linksys Analog Telephone Adapters i-xi
How This Document is Organized i-xii
Document Conventions i-xii
Related Documentation i-xiii
Technical Support i-xiii
i-xiii
CHAPTER 1 Introducing Linksys Analog Telephone Adapters 1-1
Overview 1-1
Ensuring Voice Quality 1-3
Audio Compression Algorithm 1-4
Silence Suppression 1-4
Packet Loss 1-4
Network Jitter 1-4
Echo 1-4
Hardware Noise 1-5
End-to-End Delay 1-5
Feature Descriptions 1-5
SIP Proxy Redundancy 1-5
Supported Codecs 1-6
Streaming Audio Server and Music on Hold 1-6
Silence Suppression and Comfort Noise Generation 1-7
Modem and Fax Pass-Through 1-7
Adaptive Jitter Buffer 1-7
Other Features 1-8
Technology Background 1-9
Session Initiation Protocol 1-10
Network Address Translation 1-10
NAT Overview 1-10
NAT Types 1-11