iptel.org is dedicated to the practical side of SIP-based IP Telephony communication. You can here learn about SIP and related technologies and how to set up and maintain a large-scale SIP infrastructure. iptel.org is the home of the well-proven SIP Express Router (SER) and related tools (SEMS - SIP Express Media Server, SERWeb - WEb interface to SERi; RTPProxy - Media proxy server).
