Building Telephony Systems with OpenSER is a new book from Packt, which acts as a step-by-step guide to building a high performance Telephony System. Written by Flavio E. Goncalves, this book teaches users how to develop a fast and flexible SIP server using OpenSER, an 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. This book is a well illustrated, step-by-step guide to building a SIP based network using OpenSER.
Member since:
2007-05-17
I also forgot to mention that FreeSWITCH does not require any Zaptel for conference.
Asterisk requires Zaptel for it's timing source in order to do conferencing.
FreeSWITCH has it's own internal API for timing, and it does soft-based conference just fine.
It's the best application I ever used for VoIP.