Table Of Contents - Snom 4S NAT Filter Admin Manual

Table of Contents

1 Overview ..........................................................5
1.1 Applications ...................................................................... 5
1.2 Features ........................................................................... 6
2 Architecture .....................................................7
2.1 The NAT Filter and SIP........................................................ 7
2.2 NAT ................................................................................. 8
2.2.1 How does NAT work?
2.2.2 Symmetrical RTP
2.2.3 Signalling SIP
2.2.4 Media RTP ......................................................................................................................................................................................
2.2.5 Classification of User Agents
2.2.6 Probing Media Paths
2.2.7 The Role of the NAT Filter
2.2.8 Optimizing the Media Path for Symmetrical NAT
2.3 Filter Behaviour ............................................................... 12
2.3.1 Registering without UA Support
2.3.2 Registering with UA Support
2.3.3 RTP Relay .......................................................................................................................................................................................
2.4 Scaling and Redundancy ................................................... 17
2.5 Detecting the right NAT Filter ............................................ 18
2.6 Requirements on User Agents............................................ 19
2.6.1 Non NAT-Aware User Agents
2.6.2 STUN/ICE-Aware User Agents
3 Installation.....................................................21
3.1 Windows......................................................................... 21
3.2 Linux ............................................................................. 29
4 Configuration..................................................31
4.1 Logging In ...................................................................... 31
4.2 Port Binding .................................................................... 31
4.3 System Settings .............................................................. 33
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