Then may I suggest you contact Telnyx support about this - according to the text of the error message their system have sent, only Sweden, Poland, Great Britain and Denmark are whitelisted.
I believe Telnyx support will be able to help you better than we at Cloudonix can - the error message shown in the Cockpit is exactly the error message Cloudonix have received from Telnyx.
If they ask for a SIP trace, here is the relevant part of the SIP trace for the call in session 177b31071d424fa692da4104d27e700c
:
2025-05-29T14:22:30.333Z 172.24.20.20:5060 -> 192.76.120.10:5060
INVITE sip:+4922884239070@8c7f5338-dab0-316b-a09a-d70016010ee5.sip.telnyx.com:5060;transport=udp SIP/2.0
Via: SIP/2.0/UDP 18.219.128.166:5060;branch=z9hG4bK046f.fd3b9de3b9541138c3aa7aa562b6d7ea.0
Max-Forwards: 69
From: "+4915156196505" <sip:cloudonix@md-test.cloudonix.net>;tag=as4c7244d6
To: <sip:+4922884239070@md-test.cloudonix.net>
Call-ID: 3db90a3d07af2ad23a940f085600def8@13.58.74.243:9067
CSeq: 102 INVITE
User-Agent: Cloudonix-App.Core/5.3.178_5.3.591.7_18.23.1
Date: Thu, 29 May 2025 14:22:30 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces
X-CID: f342800c-6013-4dab-9450-5511fa784752
X-CX-Cloudonix-Signature: 8eb479135d5cbebf4223df7c14ffe3f8
X-CX-CID: f342800c-6013-4dab-9450-5511fa784752
X-CX-Cloudonix-Timestamp: 1748528549
X-CX-Cloudonix-IP: 192.76.120.10
X-CX-Tags: MD,demo
X-CX-Cloudonix-Port: 5060
X-CX-Cloudonix-Origin: border
Content-Type: application/sdp
Content-Length: 337
TH: dih
Contact: <sip:btpsh-681b5213-4-69141@18.219.128.166>
v=0
o=root 1315553389 1315553389 IN IP4 3.142.130.87
s=Asterisk PBX 18.23.1
t=0 0
m=audio 31954 RTP/AVP 0 8 18 101
c=IN IP4 3.142.130.87
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=sendrecv
a=rtcp:31955
a=ptime:20
a=maxptime:140
---
2025-05-29T14:22:30.368Z 192.76.120.10:5060 -> 172.24.20.20:5060
SIP/2.0 100 Telnyx Trying
Via: SIP/2.0/UDP 18.219.128.166:5060;branch=z9hG4bK046f.fd3b9de3b9541138c3aa7aa562b6d7ea.0;rport=5060
From: "+4915156196505" <sip:cloudonix@md-test.cloudonix.net>;tag=as4c7244d6
To: <sip:+4922884239070@md-test.cloudonix.net>
Call-ID: 3db90a3d07af2ad23a940f085600def8@13.58.74.243:9067
CSeq: 102 INVITE
Server: Telnyx SIP Proxy
Content-Length: 0
---
2025-05-29T14:22:30.573Z 192.76.120.10:5060 -> 172.24.20.20:5060
SIP/2.0 403 Dialed number +4922884239070 (associated countries: DEU) is not included in whitelisted countries SWE,POL,GBR,DNK D13
Via: SIP/2.0/UDP 18.219.128.166:5060;rport=5060;branch=z9hG4bK046f.fd3b9de3b9541138c3aa7aa562b6d7ea.0
Max-Forwards: 68
From: "+4915156196505" <sip:cloudonix@md-test.cloudonix.net>;tag=as4c7244d6
To: <sip:+4922884239070@md-test.cloudonix.net>;tag=68jjcKrv48UDr
Call-ID: 3db90a3d07af2ad23a940f085600def8@13.58.74.243:9067
CSeq: 102 INVITE
Accept: application/sdp
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REFER, NOTIFY
Supported: path
Allow-Events: talk, hold, conference, refer
Reason: Q.850;cause=17;text="USER_BUSY"
Content-Length: 0