7 Trunk Management
Session Initiation Protocol (SIP) trunking is a digital method for making and receiving calls—and other real-time communications—over an IP network using SIP, an application-layer signaling protocol. In this context, “trunking” means aggregating multiple concurrent call paths (channels) into a single logical connection between your PBX and a carrier or service provider.
A SIP trunk typically provides VoIP connectivity between an on-premises PBX and the Public Switched Telephone Network (PSTN). For example, an office may run an internal PBX for extension-to-extension calling. By connecting the PBX to a SIP trunk, users can place and receive external calls to/from the public telephone network.
SIP trunking is commonly used to establish, manage, and terminate call sessions (call setup, mid-call signaling, and teardown). It is widely adopted because it’s flexible, scalable, and standards-based—helping organizations connect their phone system to external calling services without traditional physical trunks.
PortSIP PBX supports a wide range of mainstream SIP trunk providers worldwide, including (but not limited to):Topics Covered
This article includes the following topics:
Topics Covered
This article includes the following topics:
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