[SR-Users] double rr and $fs

[Asgaroth]

Hi All,

I have kamailio setup and listening on logical interfaces (for failover 
purposes) and therefore need to force the sending socket on initial 
messages. We are testing sips+tls at the moment and what we are trying 
to achive is that the TLS connection occurs from the UAC to the edge 
proxy (also responsible for the domain) and then force UDP for internal 
communications to services.

What I am comming up against is that when I force the sending socket on 
the internal interface to UDP, the record route header still shows up as 
a "sips" request. Then, at the presense server, when generating the 
NOTIFY it attempts to send it to the proxy using TLS.

My understanding was that the record route would set the uri something 
like "sip:internal_ip" when forcing the sending socket to be 
"udp:internal_ip". Is my understanding correct, or am I doing something 
wrong here?

An example subscribe message follows, the top most record-route header, 
from my understanding, should read sip:internal_ip, not 
sips:internal_ip. Is this the expected behaviour of double rr with these 
types of messages? How could I ensure that the top most record-route 
would always be a sip uri (never sips).

SUBSCRIBE sips:subscriber at domain.com:5061 SIP/2.0.
Record-Route: <sips:proxy_internal_ip;r2=on;lr;ftag=594055226>.
Record-Route: 
<sips:proxy_external_ip:5061;transport=tls;r2=on;lr;ftag=594055226>.
Max-Breadth: 60.
Via: SIP/2.0/UDP 
proxy_internal_ip;branch=z9hG4bK6c9.d7dc4801e872ce9fb5730f9e09f1889e.0;i=1.
Via: SIP/2.0/TLS 
172.16.0.121:5060;rport=33273;received=78.143.152.30;branch=z9hG4bK708ea7ba.
Max-Forwards: 69.
Call-ID: 17212ff4-4421321c8feafd63bf800080f0808080 at KX-HDV230X.
From: <sips:subscriber at domain.com>;tag=594055226.
To: <sips:subscriber at domain.com>.
CSeq: 2 SUBSCRIBE.
Allow: INVITE,ACK,CANCEL,BYE,PRACK,INFO,UPDATE,OPTIONS,MESSAGE,NOTIFY,REFER.
Accept: application/dialog-info+xml,application/rlmi+xml,multipart/related.
Contact: <sips:subscriber at 172.16.0.121:5060;alias=78.143.152.30~33273~3>.
Expires: 3600.
Event: dialog.

Any thoughts, tips, tricks would be greatly appreciated.

Cheers