Hi everyone, 

I use kamailio and have some problem, need support.

My scenario: 

- Kamailio ( x.x.x.x ) --> SIP provider (y.y.y.y)

When i callout, SIP INVITE have 2 Record Route (1 x.x.x.x , 1 127.0.0.1) and 2 Via  (1 x.x.x.x , 1 127.0.0.1), SIP provider reject it. 

I try to enable topos, SIP INVITE now have 1  Record Route x.x.x.x , 1 Via x.x.x.x. Everything look ok but Contact be masked like <sip:abcdefghijk@x.x.x.x> and SIP Provider reject it.

Any one know how to have Contact as <sip:0123456789@x.x.x.x> where 0123456789 is our SIP number.