Benoit is right!

Your issue is a common NAT issue: your SIP signalling is sending public IP address on headers, while the SDP content is publishing internal/private IP addresses:

Possible solutions:

1 - Use RTPEngine and integrate it with Kamailio

2 - let your Kamailio instance modify SDP content and replace internal/private IP addresses with the public addresses

3 - let everyone communicate via VPN and using internal/private IP addresses

I would choose option #1

Sérgio Charrua

On Tue, Apr 23, 2024 at 5:55 PM christian.marinelli--- via sr-users <sr-users@lists.kamailio.org> wrote:

Hi HB9EUE, 73!
This is a pcap file that i got with sngrep, a simple call with two client without voice:

https://drive.google.com/file/d/1WaGvBjKY46IB_hl2cpgWXNYb11Lp9B4v/view?usp=sharing

I think the problem is precisely the fact that the two clients do not communicate with each other.
If you can confirm this by the pcap file, is there a way to force the clients to transmit and receive the voice throught the SIP server intead of from a direct connection?
Thank you in adavance

Christian de IU6DJR
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