Snom 4S - page 59

snom technology AG • 59

[ S N O M 4S NAT FI L T E R ]

Currently, the following reasons are available:

• “BYE” means that the call was terminated by a regular BYE mes-

sage.

• “No 200 Ok” is used when the call did not establish (4xx code or

other ﬁnal error codes).

• “OPTIONS” is used when the call was terminated because there was

no response to an OPTIONS refresh request of the SBC.

• “media timeout” indicates that the call was terminated because the

SBC detected that the media ﬂows was disrupted.

• “one-way audio” is similar to media timeout, but happens when

there was a longer period of one way audio.

• “Maximum Session Duration” is used when the SBC closes the call

because the maximum duration (provided in the “expires” param-

eter in the action=start result) has been reached.

Contents

Main snom 4S NAT Filter Version 2.11 Table of Contents 1 Overview ..........................................................5 2 Architecture .....................................................9 3 Installation .....................................................23 4 Conguration ..................................................31 5. Web Server Integration ..................................51 6. SNMP ..............................................................61 7 Checklist for Installation ................................65 1 Overview 1.1 Applications 1.2 Features Page Page 2 Architecture 2.1 The NAT Filter and SIP 2.2 NAT 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 Classication 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 SBC Behaviour 2.3.1 Registering 2.3.3 RTP Relay Page 2.4 Scaling and Redundancy 2.5 Detecting the right NAT Filter 2.6 Requirements on User Agents 2.6.1 Non NAT-Aware User Agents 2.6.2 STUN/ICE-Aware User Agents 2.7 Dening the Maximum Session Time Page 3 Installation 3.1 Windows Page Page Page Page 3.2 Linux Page Page 4 Conguration Page Page 4.3.2 Preparing Recovery 4.3.3 General Outound Proxy 4.3.4 Media Ports 4.3.5 Port Budgets 4.3.6 Media Relay 4.3.7 Controlling Routing 4.3.8 Multiple 2xx Handling 4.3.9 Challenging 4.3.10 Trusted Addresses 4.3.11 Maximum Packet Size 4.3.12 Silence Suppression 4.3.13 Connection Oriented Media 4.3.14 Removing Headers 4.3.15 Codec Control 4.3.16 Web Server Integration 4.3.17 CLIR Addresses 4.4 Timeout Settings 4.4.1 Register Timeouts 4.4.2 Call Timeouts 4.5 Security Settings Page 4.6 Outbound Proxy List 4.7 System Information 4.8 Server Log 4.9 Trace 4.10 Call History 4.11 Current Ports 4.12 Currently Handled UA 4.13 Memory Statistics Page 5. Web Server Integration 5.1 Interface to the Web Server 5.2 Authentication Page Page 5.3 Registration 5.4 Call Initiation Page 5.5 Call Termination Page Page 6. SNMP 6.1 Setup of the SBC 6.2 Setup of the Tools 6.3. Available OID Page Page 7 Checklist for Installation 7. 6.1 Linux 6.2 Windows 7. Readers Feedback