The SIP Express Router An Open Source SIP Platform

The session initiation protocol (SIP) is constantly gaining in popularity and acceptance as the signaling protocol for next generation multimedia communication. This paper describes a scalable and reliable open source SIP platform called the SIP Express Router (SER). SER does not only support basic SIP features but also advanced features such as messaging and presence, translation between SIP and SMS or Jabber as well as full featured application programming interfaces. In this paper we will describe the architecture of SER, its different features and technical specifications.