It seems to me you should look at the “advertise” parameter to the core 
“listen” directive:

https://www.kamailio.org/wiki/cookbooks/5.5.x/core?s%5B%5D=advertise#listen

—
Sent from mobile, with due apologies for brevity and errors.

> On Oct 5, 2021, at 1:20 PM, Voip support <[email protected]> wrote:
> 
> 
> Dear Community, 
> 
> I have a need of communicating with other servers using private IP with 
> private IP in Via and SDP connection information but at same time sometime 
> need connect to public IP SIP server and on outgoing INVITE's i need 
> advertise public IP in Record-Route and SDP Connection information.
> 
> Currently if i work on listen=udp:privateip:5060 i get working the LAN part 
> but cannot work over internet (no audio) but when i add advertise i get SDP 
> public IP also over local network.
> 
> Is it possible to solve this case using one NIC adapter?
> I am using RTPProxy.
> 
> Please help me out. I tried to add second network adapter with advertise and 
> mhomed=1 something started to work but i think i would need work on the call 
> direction and different rtpproxy_manage handling on outside INVITEs and 
> incoming 200 OK responses.
> 
> I am not sure if this is  the right way to do it - maybe there is some easier 
> method of achieving what i need using one interface ?
> 
> Best regards,
> Tom
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