How do I change the initial speaker IP address?

[greychain]

My customer is using a VPN to connect to the SIP provider but I'm having trouble getting the correct IP to be sent to them . It's currently sending their internal private IP, whereas the SIP provider is expecting the Voip traffic to go out the VPN IP. The 172 address is the private IP and the VPN IP is 103.210.210.49. I have set the "Select which IP to use in 'Contact' (SIP) and 'Connection'(SDP) fields" to the VPN IP.

Incoming call work once I deselected the PBX delivers audio, outgoing call dont.

Where should I be looking?

 

[TheodorosG_3CX]

So the issue is with the ip in the Contact? Is he expecting the ip to another field?

 

[greychain]

Traffic is being sent to 172 but he is expecting to send to 103.

 

[TheodorosG_3CX]

Check guidelines below as this information depends on network configurations:
• https://www.3cx.com/blog/voip-howto/sip-invite-header-fields/
• https://www.3cx.com/blog/voip-howto/sip-invite-header-fields/

 

[greychain]

I looked at that page, and tried to adjust the From: Host Part and changed the value to 103.... but that didn't seem to work

 

[TheodorosG_3CX]

This will not change from the outbound parameters

 

[greychain]

Where would I change the source address?