SIP Trunk Service is a type of VoIP and streaming media service that delivers both voice and unified communications in one converged method. It is a telephone service and a way to browse the Web, email, and text, over modern telephony networks. SIP or Session Initiation Protocol is today’s standard for VOIP trunk service over public or private IP networks.

SIP trunking services afford businesses a wide range of benefits and flexibility not readily available in traditional telephone services . In its most basic form, SIP trunks provide access to both land-line and mobile calling. When comparing SIP trunking vs PRI, it also offers many of the same calling features, with a lower cost, more flexibility, and increased scalability. In order to use a SIP trunking service you must have an IP PBX system which supports Session Initiation Protocol.