Hi Daniel.
I have try. Now "180 ringing" is sending to SBC by kamailio.
But kamailio adds "Contact" header to forwarded message.
Can you look, please?

Linphone to kamailio

SIP/2.0 180 Ringing 
Via: SIP/2.0/TLS 1.2.3.4:5061;branch=z9hG4bK460b.6e02acd9418a5aae97a9d5f79aeffc53.0 
From: <sip:1111@1.2.3.4:5061>;tag=14003117305244 
To: <sip:2222@5.6.7.8:5061;transport=tls;user=phone>;tag=S7nIf9Z 
Call-ID: 0KaR2073911201UQbcGhEfDeMek 
CSeq: 669313 INVITE 
User-Agent: LinphoneAndroid/4.0.1 (belle-sip/1.6.3) 
Supported: replaces, outbound 
Content-Length: 0 

kamailio to SBC

SIP/2.0 180 Ringing 
From: <sip:1111@1.2.3.4>;tag=14003117305244 
To: <sip:2222@5.6.7.8>;tag=S7nIf9Z 
Call-ID: 0KaR2073911201UQbcGhEfDeMek 
CSeq: 669313 INVITE Content-Length: 0 
Via: SIP/2.0/UDP 1.2.3.4:5060;rport=5060;received=10.56.63.10;branch=z9hG4bK00000005167007511555 
Contact: <sip:atpsh-5bf3d61d-2547-1@10.56.42.33> 
Record-Route: <sip:KITS1.MSS.LIFE.COM:5060;transport=UDP;lr> 


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