[SR-Users] Strange auth_challenge behaivor on 407

Hi I'm using version: kamailio 5.1.2

I have strange issue with auth_challenge

kamialio works as NAT handler. When Register comes kamailio handles nat and save original ip:port at the received field in location table

I found that when local port in contact is different than external port reply 407 on INVITE comes to externalip (from received) : internalport(from contact) And never reaches destination

for exmaple Register comes from 192.168.1.10:50555

Kamailio saves at the Received 12.1.1.12:1030

but when invite comes form 12.1.1.12:1030 kamailio sends reply to 12.1.1.12:50555

i don't think that this is an issue in kamailio source code but i can find where i can configure it