What Is SIP Trunking?
Information About Technology
Core Definition
SIP Trunking is a way to connect a company’s on-premise phone system (PBX) to the Public Switched Telephone Network (PSTN) using the internet and the Session Initiation Protocol (SIP). This replaces traditional physical phone lines with a virtual connection, providing voice over IP (VoIP) capabilities.
Benefit Definition
SIP Trunking offers businesses numerous advantages over traditional phone lines. It’s cost-effective by reducing reliance on physical infrastructure, provides flexibility for scaling up or down quickly, and enhances features like caller ID, call forwarding, and disaster recovery.
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Technical Definition
SIP Trunking essentially creates a “virtual pipeline” between an organization’s PBX and an Internet Telephony Service Provider (ITSP). SIP handles the signaling for call setup, management, and termination, while voice data itself is often transmitted using the Real-time Transport Protocol (RTP). SIP Trunks can carry not only voice calls but also multimedia communications like video and instant messaging.
