Connecting External SIP PBXs to the Cloud PBX

If your company has its own PBX, you can integrate it into the unified numbering plan of the cloud PBX. Employees from different branches will be able to make free calls and transfer calls to each other using extension numbers. These calls will be recorded and displayed in the History section.

You can connect various types of PBXs to the cloud PBX, including traditional hardware-based PBXs, software-based PBXs (such as Asterisk), and even cloud PBXs from other service providers.

1. Go to More — Connecting other PBXs.

2. Click Add a PBX next to the Other SIP PBXs option.

3. Enter the required data:

• Name. Give a clear name to the connected PBX to avoid confusion among multiple systems.
• Internal numbers. Specify the internal numbers of the connected PBX or their ranges so that the cloud PBX knows which calls should be sent to the connected system. You can add as many numbers and ranges as possible.

Short numbers of PBXs should not overlap with each other. If you specify a number during the addition of internal numbers that already exist in the cloud PBX, the system will alert you about it:

If you ignore this warning, calls to such numbers will be directed to the internal subscriber of the cloud PBX instead of the SIP PBX. To enable the ability to call all employees of the connected SIP PBX, you need to resolve the overlap in extension numbers.

4. Copy the settings and click Connect.

5. Configure the settings on the side of the PBX connected — refer to the examples at the end of the article.

After configuring the settings, the status of the SIP PBX connection in the cloud PBX personal account will change to Connected and will be designated with a green indicator. This means that you now have access to calls using short numbers between users of the cloud PBX and the connected SIP PBX.

The office PBX calls will be displayed under the name of that PBX in the History section.