Building Telephony Systems with OpenSER

Description

OpenSER is a flexible, free open-source VoIP server based on the Session Initiation Protocol (SIP), an application-layer control (or signaling) protocol for creating, modifying, and terminating sessions with one or more participants, including internet telephone calls, multimedia distribution, and multimedia conferences.

Engineered to power IP telephony infrastructures up to large scale, OpenSER is written in pure C for Linux/Unix-like systems with architecture-specific optimizations to offer high performance; it is able to handle 4 million users on a single processor server. The server keeps track of users, sets up VoIP sessions, relays instant messages, and creates space for new plug-in applications.

It can be used on systems with limited resources as well as on carrier-grade servers, scaling up to thousands of call setups per second. It is customizable, being able to feature as fast load balancer; SIP server flavors: registrar, location server, proxy server, redirect server; gateway to SMS/XMPP; or advanced VoIP application server.

CONTENTS:

Preface
Chapter 1: Introduction to SIP
Chapter 2: The SIP Express Router
Chapter 3: OpenSER Installation
Chapter 4: OpenSER Standard Configuration
Chapter 5: Adding Authentication with MySQL
Chapter 6: Building the User Portal with serMyAdmin
Chapter 7: Connectivity to the PSTN
Chapter 8: Call Forward and Voice Mail
Chapter 9: SIP NAT Traversal
Chapter 10: OpenSER Accounting and Billing
Chapter 11: Troubleshooting Tools
INDEX