Receiving a call from a device I can't configure

FreePBX Endpoints
1

Hi

I am used to configuring VoIP extensions with FreePBX but now I have a strange case where I need to receive a call from an Akuvox device that I can’t reconfigure in the best way for FreePBX, so I can cater to other requirements (and because the UI offers limited options for what I need).

The device doesn’t register a SIP account, and always calls the same way.

On the device side, this is what it claims it’s doing:

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image746×123 11.6 KB

And on the FreePBX server, which is 10.0.0.10 (and there is connectivity between the two subnets), I see only this:

[2026-02-27 16:04:49] NOTICE[1405]: 
res_pjsip/pjsip_distributor.c:676 log_failed_request: 
Request 'INVITE' from '<sip:[email protected]>' 
failed for '192.168.30.20:5060' (callid: 1112027321) - 
Failed to authenticate

So, basically, my question is, how can I make FreePBX accept only this call, unregistered?

2

No answer in a day, so I’ll have a go.

I think you can do it by defining it as a trunk, but setting the context to “from-internal”. You might also find a solution which defines it as a trunk, with the default context, and uses the number it dials as the DID.

It is also possible that the restriction that extensions much be incoming registration and incoming authentication has been removed since FreePBX 13, for which online documentation is available.

3

David, thank you for your answer. I am in a support case with Akuvox trying to get a better solution, but I don’t think it’s going anywhere and I hope to try your suggestions next week. Thanks.

4

Situations like that in FreePBX can be confusing, especially when a device shows up making calls but isn’t clearly listed in the endpoint configuration. I’ve seen cases where it turned out to be an old extension still registered or a SIP device using cached credentials. Checking the active registrations and call logs usually helps track down which endpoint is actually placing the call.