The Basics of SIP Trunking
"TDM trunks have long served to connect corporate PBXs to the public switched telephone network (PSTN). But with more companies moving to VoIP, SIP trunking has become an increasingly popular technology companies can use to simplify their network architecture and save money," writes IDG News Service reporter Brad Reed on Computerworld.
"Just what is SIP trunking?" Reed asks.
"Let's take it one part at a time. SIP refers to Session Initiation Protocol, the standard developed in the 1990s by the Internet Engineering Task Force that is used to set up and terminate VoIP calls and generate dial tone. A SIP trunk, then, is a broadband Internet link that utilizes SIP to connect a company's IP-based PBX to an Internet telephone service provider (ITSP)," Reed explains.
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SIP trunking: A primer