Telnyx SIP Trunk error

[vish2cx]

Hello, we are getting this error after adding Telnyx SIP trunk from 3cx dedicated on-premises server. Using telnet, we verified the network connectivity to sip.telnyx.com and port 5060 and 5061 from 3cx server, we were able to reach it successfully. Please let us know what could be causing the SIP trunk registration failure. From Telnyx portal, everything looks fine. Below is the error received in event log:

Registration at Telnyx LLC has failed. Destination (sip:64.16.250.10:5060;lr) is not reachable, DNS error resolving FQDN, or service is not available.

 

[Evolute IT]

This is usually due to your DNS being unable to resolve.

How is the system deployed? Make sure your DNS are set to Google's or Cloudflare's.

 

[vish2cx]

This is usually due to your DNS being unable to resolve.

How is the system deployed? Make sure your DNS are set to Google's or Cloudflare's.

Hello, Below is the command line output from 3cx server running on-premises. We are able to reach sip.telnyx.com from 3cx server but from 3cx admin portal we are seeing the red signal instead of green for the Telnyx SIP trunk. What could be causing this?

=========================================
root@3cx:~# nslookup sip.telnyx.com

Server: 8.8.8.8

Address: 8.8.8.8#53


Non-authoritative answer:

Name: sip.telnyx.com

Address: 192.76.120.10

============================================
root@3cx:~# telnet sip.telnyx.com 5060

Trying 192.76.120.10...

Connected to sip.telnyx.com.

Escape character is '^]'.

^]
===========================================

 

[quadrant]

Check the blacklist on the PBX for IP 192.76.120.10