If your SIP phone is doing it, try turn off STUN/TURN. 

If it’s a SIP ALG (application layer gateway) on an intermediate NAT router, 
try turning that off. 

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

> On Apr 8, 2019, at 8:10 AM, vinod mn <[email protected]> wrote:
> 
> Hi ,
> I have a cloud server, when I make call from a sip phone (registered with 
> kamailio),
> in the INVITE header I am seeing the via header with public IP, is there any 
> way that I can modify via header to send only the private IP.
> The calls are landing on another sip gateway, they will allow only the 
> private IP. 
> Please let me know, is it possible to replace.
> 
> I tried all the replace functions but it is not working.
> 
> 
> -- 
> Thanks and regards 
> Vinod.M.N
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