SIP trunking is a Voice over Internet Protocol (VoIP) and streaming media service based on the Session Initiation Protocol (SIP). SIP trunks allow multiple simultaneous streams of VoIP calls to be routed through a carrier’s network and delivered to an organization as voice packets. SIP trunking services are sold by Internet telephony service providers and provide telephone and unified communications (UC) services to customers that have SIP-based PBXs and UC systems.
In millions of global installations, customers use SIP trunks exclusively, which connect them to digital unified communications options. In many cases, SIP trunking has completely substituted the well-known T1/E1 and Primary Rate Interface (PRI) connections to the public-switched telephone network (PSTN) because it offers easier and more inexpensive ways to connect. Because SIP trunking is the latest trend in the world of telecommunications IT, it’s hard to imagine that a new telephone system wouldn’t support SIP trunking.