Snom 4S Media Server Administrator's Manual

© 2002 snom technology Aktiengesellschaft. All Rights Reserved. This document is supplied by snom technology AG for information purposes only to licensed users of the snom 4S registrar proxy and is supplied on an “AS IS” basis, that is, without any warranties whatsoever, express or implied. Information in this document is subject to change without notice and does not represent any commitment on the part of snom technology AG. The software described in this document is furnished under a license agreement and may be used only in accordance with the terms of that license agreement. It is against the law to copy or use this software except as specifically allowed in the license. No part of this document may be reproduced, republished or retransmitted in any form or by any means whatsoever, whether electronically or mechanically, including, but not limited to, by way of photocopying, recording, information recording or through retrieval systems, without the express written permission of snom technology AG.

Welcome to the SIP World! SIP is becoming more and more accepted in the area of VoIP. Many companies are working on SIP solutions and making great products that will make telephony much easier and better. SIP without a proxy makes no sense. Entering IP addresses to find another user cannot be the future of telephony. Locating http web content and finding email users has become a part of todays communication behavior and sure will be part of telephony in the near future. However, for the small and medium size office, we are missing a simple yet powerful solution that is available for a standard-software price. That is why we are making this simple and straightforward proxy available. snom 4S stands for “snom soft switch for small and medium enterprises“. That means, the snom 4S proxy was designed for environments handling up to 1000 users with normal traffic. In environments where you need more features and better scalability, we would be happy to refer you to other companies offering carrier grade and feature-rich proxies that solve these problems. This product is a proxy/locations server with built-in registrar which means this software is responsible for locating users. Features like follow me and group calling are therefore supported; however media services like mailbox and music on hold are not part of the software. You should use a media server for this. Interoperability is important to us. We have tried to stick to the SIP standard as well as possible and tested the phones of other vendors. We hope that this will help to build up a flourishing VoIP telephone industry in which the products of the different vendors work together like the products in the computer industry do today. We believe that having a choice is good for you and therefore good for us. This manual gives you a brief introduction to VoIP and SIP, explains the installation process for Windows and Linux and shows how

[ S N O M 4 S P R O X Y / R E G I S T R A R M A N U A L ] to run the SIP proxy. For additional snom 4S information, please visit our Web site at http://www.snomag.de and if you have any comments and suggestions about snom 4S, please contact us through snom technology AG’s support link Web site. We would appreciate your feedback. And, of course, you can reach us at sip:[email protected]. Thank you and have fun using the snom 4S! Dr. Christian Stredicke Nicolas Peter-Pohland

Table of Contents Welcome to the SIP World! ........................................3 The Voice over Internet Protocol................................7 Why SIP?................................................................................... 7 Open Standards ......................................................................... 8 What You Can Expect and What Not .............................................. 9 The SIP Architecture ................................................11 User Agents ............................................................................. 11 Proxies.................................................................................... 12 Location Server ........................................................................ 12 Registrars................................................................................ 12 Media Server............................................................................ 13 Gateways ................................................................................ 13 snom 4S Framework.................................................15 Proxy ...................................................................................... 15 SIP NAT Gateway...................................................................... 16 Media Server............................................................................ 17 Installation ..............................................................19 Windows Installation ................................................................. 19 Uninstalling in Windows ............................................................. 23 Linux Installation ...................................................................... 24 General Concepts .....................................................27 Security ................................................................................. 27 Reliabilty ................................................................................. 28 State ...................................................................................... 29 Overlap Dialling........................................................................ 30 Sequential Forking .................................................................... 30 Network Address Translation ...................................................... 31 Routing ................................................................................... 32