Trunk

A trunk is a communications line or link designed to carry multiple signals simultaneously to provide network access between two points. Trunks typically connect switching centers in a communications system. A trunk is a relationship between two network elements that use the SIP protocol to communicate between themselves.

Trunks can be set up via two methods:

1. A Source IP address, Protocol (UDP, TCP, TLS), and Source Port associated with an Orchestrator’s SIP Signaling IP address and port. The Orchestrator’s “listening” port will always be 5060 for UDP and TCP connections, and 5061 or 5062 for TLS v1.2 connections. TCP and TLS connections use random ephemeral source ports. For these connections, use a port value of 1, which signifies the Orchestrator will accept SIP messages from the Source IP address regardless of the Source Port used.

2. A SIP Registration can be configured to the Orchestrator's IP(s).

An alternate and completely different definition of a Trunk is a single port, call path, session, or voice channel between two network elements.