Problem on SIP trunk

[telmen]

I recently migrated my 3CX system to a new Lightsail instance running v20. The previous instance was working perfectly, but after moving to the new server and assigning a static public IP, my SIP trunk is no longer working as expected.

Environment​

• 3CX v20
• Hosted on AWS Lightsail
• New instance with static public IP

What works​

• SSH access works normally
• Admin Console accessible via
  https://PUBLIC_IP:5001
• Web client loads correctly
• Extensions are registered

What doesn’t work​

• Incoming calls only ring continuously
• No IVR / waiting music
• Call does not proceed to Digital Receptionist
• Event log shows SIP activity but no proper routing

Lightsail IPv4 Firewall:

• TCP 443 (HTTPS)
• TCP 5001 (3CX Admin)
• TCP 5060–5062 (SIP)
• TCP 5090
• UDP 5060
• UDP 5090
• UDP 9000–10999 (RTP)

 

[KyriacosS_3CX]

Please check with the SIP provider directly, as they should be able to say what they do not like about the registration attempt.

 

[telmen]

Yes I have but even they don't know what's going on. they even check known working SIP trunk from another V20 on mine but still it didn't work

 

[KyriacosS_3CX]

Check outbound rules, and ask them if they need the call to be in full E.164 format (+country_code).