Thank's david
in my kamailio configuration I am using *listen=udp:192.168.131.69:5060 http://192.168.131.69:5060/ advertise 221.20.20.12:5060 http://221.20.20.12:5060/* (as mentioned by you) and when the kamailio sends an invite to sip-gateway I am seeing this sip-gateway ip is *192.168.132.67 * and this gateway don't have any public-ip assigned ..
Via: *SIP/2.0/UDP 221.20.20.12:5060 http://221.20.20.12:5060/;* branch=z9hG4bKaa6a.14c65f5675077ae7b0df70b02516979b.0 Via: SIP/2.0/UDP 192.168.113.112 :50386;received= 192.168.113.112 ;branch=z9hG4bK-d87543-550b984016109617-1--d87543-;rport=50386
I want private ip instead of public ip in the first via