3CX

3CX is one of the most common DACH PBX systems. Callina connects to 3CX as a SIP trunk that handles a specific extension, ring group or queue.

Step 1 — Create a SIP trunk in 3CX

1. In the 3CX management console, go to SIP Trunks → Add SIP Trunk.
2. Provider: Generic SIP Trunk.
3. Trunk name: Callina.
4. Authentication: enabled, with username + password (use a strong, randomly-generated password).
5. SIP server: enter the host shown in Callina → Settings → SIP → 3CX.
6. Save and Reset the trunk.

Step 2 — Configure Callina

In Callina → Settings → SIP:

1. Provider: 3CX.
2. Paste the SIP server, username and password from step 1.
3. Add 3CX's public IP to the allowlist.

Step 3 — Route calls to the trunk

In 3CX, create an inbound rule that routes the calls you want Anna to answer (a specific DID, queue, or out-of-hours route) to the new SIP trunk. Test by calling the DID — Anna should answer in under 3 seconds.

Troubleshooting