500 Service unavailable / Server Failure

[icsl]

Hello,
I am getting the Following error when I try to make a call through peoplefone.ch:
Leg L:190.2[Line:10008>>0043XXXXXXXXXXX] is terminated: Cause: 500 Service Unavailable/INVITE from 95.128.80.5:5060
11/13/2018 10:33:57 AM - Call to T:Line:10008>>0043XXXXXXXXXXX@[Dev:sip:[email protected]:5060] from L:190.1[Extn:XXX] failed, cause: Cause: 500 Service Unavailable/INVITE from 95.128.80.5:5060

Here is the full Capture:
https://pastebin.com/mfk8vJa9

3CX Version
15.5.0

 

[Alphabetic]

Have you spoken to your SIP provider?

 

[icsl]

Yes, they say everything is good on their site. I was also able to make a call through an asterisk pbx.
The rest of the providers on the 3cx work. This one is the only one i have a problem with. The strange thing is it used to work perfectly.

 

[YiannisH_3CX]

Hello @icsl

From the provided data i can see the message coming from your provider. The first thing to do is to contact them and ask them why they are sending this error message