What Is A SIP Trunk?

Information About Technology

Core Definition

A SIP Trunk is a virtual connection that enables Voice over Internet Protocol (VoIP) communication between a company’s on-premise phone system (PBX) and the Public Switched Telephone Network (PSTN). It operates using the Session Initiation Protocol (SIP) to manage call setup, control, and termination, and consolidates multiple voice channels into a single internet connection.

Benefit Definition

SIP trunking offers significant advantages over traditional phone lines. This includes cost savings by eliminating the need for physical lines, increased flexibility to easily add or modify phone services, and enhanced features like seamless call forwarding and disaster recovery options.

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Technical Definition

Technically, a SIP Trunk acts as a digital bridge between an organization’s PBX and an Internet Telephony Service Provider (ITSP). SIP handles the signaling aspects of calls while the voice data itself often travels using the Real-time Transport Protocol (RTP). This virtual connection allows businesses to make and receive phone calls over the internet, greatly enhancing communication capabilities.

 
 

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