SIP Trunking
Also known as: SIP trunk, session initiation protocol
SIP trunking is a method of delivering phone service over the internet using the Session Initiation Protocol, connecting a business phone system to the public telephone network.
SIP trunking uses the Session Initiation Protocol to carry voice calls over an internet connection, giving a business as many concurrent call paths as it needs without physical phone lines. It is a common way for larger phone systems and platforms to connect to the public telephone network.
For call tracking, SIP and VoIP are the layer beneath the product: they move the actual audio while the platform handles numbers, routing, and attribution on top.
Frequently asked questions
How does SIP trunking relate to VoIP?
SIP is the protocol that sets up and tears down calls in most VoIP systems. A SIP trunk is the virtual line that carries those calls between a business phone system and the wider phone network, replacing physical phone lines.
How does SIP trunking work in simple terms?
Instead of physical phone lines, a SIP trunk is a virtual connection over the internet between your phone system and the public phone network. When a call is placed or received, SIP sets up the session and your internet connection carries the audio, so you can run as many simultaneous calls as your bandwidth allows.
Related terms
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