Step-by-step: setting up the SIP trunk on FreePBX

To connect your 25-Line account to FreePBX:

1. In FreePBX go to Connectivity → Trunks → Add Trunk (chan_pjsip recommended).
2. Give the trunk a name and set the Outbound CallerID to the DID you want presented (this determines your rate tier — a matching in-country number earns national rates).
3. Under pjsip Settings → General, set: - Username: your account user ID - Secret: your account password - SIP Server: sip.transcom.net - SIP Server Port: 5060 (or 5061 for TLS) - Registration: Send
4. On the Codecs tab, allow ulaw (G.711u), g722 and g729.
5. Submit and Apply Config, then check Reports → Asterisk Info → Registries shows the trunk registered.
6. Add outbound routes to send calls over the trunk and inbound routes to map DIDs to extensions or IVRs.

Test with the FreeVoIP echo (4443) and Caller ID (1-555-555-0911) numbers.