Snom 4S - page 43

snom technology AG • 43

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

To restrict the login, you should set a username („admin“ is the

default) and a password. You need to enter the password twice, so that

typing mistakes do not block your NAT Filter.

The Session Timeout is the number of seconds after which the

NAT Filter web server deletes the session. If you access the web server

after this time, you need to log on again. If you change the password dur-

ing a session, you do not have to enter the new password for the existing

session.

If you have bought a certiﬁcate, you may upload that certiﬁcate

from the web page. Just point the NAT Filter to the ﬁle and press the Load

button. Otherwise, the server will use a default certiﬁcate which causes

you to trigger a security warning popup when you enter the web page.

However, as the server is not open to public access, we think this is not

so important.

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