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Trunks

Documentation for Trunk and Dial plan Configuration

📄️ Connecting Branch Offices

This section describes how to connect two Vodia PBX systems so that calls from the first location to the second location will be routed through VoIP rather than through the local PSTN. This can be useful for calls inside the company where someone from the branch office 1 wants to talk to someone on the branch office 2; but it can also be used to use the branch office 2 PSTN gateway to terminate calls made from branch office 1. This can significantly lower termination costs, for example when the first office in one country and the second one in another. Two different scenarios are presented:

📄️ CO-Lines

CO-lines can serve multiple purposes on the system. They allow you to channelize a trunk and can be used in a way similar to the CO-lines of traditional TDM-based PBX systems. Although the Vodia PBX runs calls through SIP trunks over computer networks instead of connecting to public telephone lines (at least directly), CO-lines are still useful for determining which calls are active between the system and the outside world. To begin with, each trunk may have several CO-lines, and because users can subscribe to the state of CO-lines, each CO-line name must be unique within a domain. For example, four CO-lines might be set up on trunk 1 with the names co1 co2 co3 co4, while trunk 2 might contain co5 co6 co7 co8 (the list must be delimited by spaces). The system will reject names for CO‑lines that are already in use by accounts or other CO-lines in the same domain. With regard to monitoring, the CO-lines that you establish can be monitored from the domain's Account list. If a CO-line is in use, it will display the extension and the outside phone number to which it is connected.