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"Forbidden" error when calling
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complex1 Offline
3CX Adv. Cert. Engineer

Posts: 1,488
Joined: Jan 2014
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Post: #6
RE: "Forbidden" error when calling
(08-31-2021 11:30 PM)w60B-Spain Wrote:  Thanks for the suggestion @complex1

I tried with STUN Enabled and the parameters you suggested but the results are the same :-( , I still get a "Forbidden" message every other call...

This is driving me crazy

(08-31-2021 05:53 PM)complex1 Wrote:  
(08-31-2021 03:53 PM)w60B-Spain Wrote:  Hi, Thanks a lot for the suggestion complex1,

Indeed one of the first thing I tried was disabling any SIP ALG functionality from the router (Edgerouter from Unifi), but sadly it did not change anything, the behaviour was still the same. The router itself is almost blank in terms of configuration, there are no firewall rules applied for either in or out of the interface, nor there is anything else but ports redirection for 5060-5070 UDP ports as well as some RTP ports used on teh configuration. Despite those 2 things, the rest is pretty much basic stuff. :-(

Any other ideas? Is there any other part of the log I could look into to gather more information to trace it?

Thanks in advance!



Please try using STUN.

Network > NAT > STUN
Active: Enable
STUN Server: stun.sipgate.net
STUN Port: 3478


I think you did everything you could have done.
I suggest you contact your VoIP provider and ask them to assist you. Maybe they know a solution to this problem?

Kind regards,

I am not an employee of Yealink.
Dutch is my native language, not English. Apologies for my imperfect grammar.
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09-01-2021 01:16 AM
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RE: "Forbidden" error when calling - complex1 - 09-01-2021 01:16 AM

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