Solved 3CX and Cosmote (Greece) "Registration has failed" error

[gewrgiose]

Dear friends,

I will need your help for a problem I am dealing.

Cosmote informed me about changing the ip's for registering (Registration/Proxy/Outbound Proxy) from "ims.otenet.gr" to DNS: 212.205.212.205 or 195.170.0.1 or 195.170.2.2.

For "Registrar/Server/Gateway Hostname or IP" they gave these ip s: 195.167.21.200 & 195.167.22.200 or, 195.167.16.180 and 195.167.16.183

Also they change the form of username, from

+30#number# to

+30#number#@local-pbx-ip
(example [email protected])

Also "contact" for registering they mention must have the same form (example [email protected])

I did all the changes with many testing but I get always the same error:

Same error for 212.205.212.205, 195.170.0.1 and 195.170.2.2...

With the previous username style (just the +30#number#) and instead of ip s the "ims.otenet.gr", it is working without problems.

Has anyone (from Greece or abroad) done this new configuration succesfully or can understand what I do wrong?

Thank you in advance,
George

P.S.:My knowledge in 3CX is very basic.

 

[JohnS_3CX]

Hi,

Based on what another user reported, I think you have probably misconfigured your trunk settings.

You should contact your provider to assist you in properly setting up your trunk.

https://www.3cx.com/community/threads/little-help-plz.77623/

 

[gewrgiose]

Hello John,

Thank you for your reply - I see exactly the same issue with mcnick50

If necessary please erase this post / no need 2 posts for same problem!

The provider answered to me that the problem is on the side of my PBX but didn't give any details.
So I search alone what is wrong from my side.

Will check what you answered to that post and will come back with news.

 

[gewrgiose]

Ι applied your advice what to change but keep getting the same error.


Do you thing I should check and change something at the Outbound parameters, too?

Thank you again,
George

 

[JohnS_3CX]

Hi George,

The provider is saying that you need to use specific DNS servers.

Those should be configured on the OS so that when it queries to discover "ims.otenet.gr" the answer to the query will be provided by their own DNS servers will presumably reply back to your machine with the correct records.

 

[gewrgiose]

Hello John,

I talked with Cosmote support and also to another forum user that had the same issue.

Actually the guideness Cosmote gave me through email and phone, never worked.
If I replace the "ims.otenet.gr" with the ip's they gave cannot register.

If also I replace the usename "+302....." with "+302...@192...." then, I get wrong Username/Password message and again, doesn't register...

I use the new DNS servers on the 3cx machine and have it on "Auto discovery" and is working ok (like you said on the post you sent me)

That was also the guideness the forum user here told me (plus if problem to check a couple other things) .
You both totally know a lot more than the technicians I spoke...

If I notice anything in the future I will upload it here for reference.

Thank you all so much for the assist and interest.

Wish you and all members Merry Christmas and a Happy New Year.