Outbound issue - 403 Unknown User/Endpoint Not Allowed

[Fitim]

Hello,
Recently i am having this issue with outbound calls. It has been working fine for over a year but now I cannot make oubound calls. I am using generic trunk from our Telekom Provider.
Call or Registration to xxxx@(Ln.10001@ptk) has failed. 213.163.99.6 replied: 403 Unknown User/Endpoint Not Allowed; from IP:xxxx.6:5060

any ideas ?

 

[Alphabetic]

Contact your provider.

 

[Fitim]

I have, they have no idea (sh** support)

 

[Fitim]

The weird thing is that Trunk is working on Zoiper

 

[Fitim]

Quick update, i got the ougoing calls to work with stun enabled. Still cannot find the cause

 

[JohnS_3CX]

Hi @Fitim

There's only a couple of direct ways of dealing with this

a) Contact the provider and have them help troubleshoot

b) Ignore them entirely and handle it yourself (requires some basic SIP knowledge at least)



...there is also c) use a supported provider that has a pre-configured template in 3CX
https://www.3cx.com/partners/voip-providers/

 

[Fitim]

TBH that is my aproach but it sucks not having the support from the provider side. As per template, Kosovos telekomm is not supoorted by 3cx trunk templates

 

[JohnS_3CX]

In this case if you are out of options, I would set up a live Wireshark on my server and make tweaks to the trunk config while watching the SIP messages and seeing the provider replies.

You could also hire a 3CX Partner to try and help you. There might not be any in Kosovo but there may be some international ones, or ones from neighboring countries that will be willing to help.

https://www.3cx.com/ordering/find-reseller/

 

[Fitim]

I am the only one from Kosovo

 

[JohnS_3CX]

The provider does not sound promising from your description, but if you find a good contact there perhaps if you convince them to join interop. It will make your life a lot easier and will make selling 3CX easier too.

https://www.3cx.com/blog/docs/voip-provider-interop-explained/