### Description If the INVITE contains `;ob` but no `;+sip.instance=xxxx;reg-id=N` then a flow-token is not added to the record-route header. This is contrary to RFC5626. #### Reproduction Configure 2 x kamailio according to module outbound; i.e 1 x edge proxy and 1 x internal proxy/registrar. UA1 and UA2 have already REGISTER'ed with `;+sip.instance=...;reg-id=...`. ``` UA1, UA2 --- edge proxy --- internal proxy ``` Send INVITE from UA1 to UA2 with `;ob` but no other params: ``` Contact: <sip:user1250@192.168.12.45:5063;transport=TLS;ob> Record-Route: <sip:127.0.0.1;r2=on;lr> Record-Route: <sip:192.168.13.50:5061;transport=tls;r2=on;lr> ``` Observe that there is no flow-token added. Send INVITE from UA1 to UA2 with `;ob` with `;+sip.instance=...;reg-id=...`: ``` Contact: <sip:user1200@192.168.122.15;transport=tls;ob>;+sip.instance="<urn:uuid:0000 `0000-0000-0000-0000-0012341234>";reg-id=7 Record-Route: <sip:Jz0HaDIr1ZoqEAPAqA0yE8XAqAwqyAo=@127.0.0.1;r2=on;lr> Record-Route: <sip:Jz0HaDIr1ZoqEAPAqA0yE8XAqAwqyAo=@192.168.13.50:5061;transport=tls;r2=on;lr> ``` Observe that there is a flow-token added. #### Debugging Data #### SIP Traffic ### Possible Solutions ### Additional Information Version; kamailio 5.6.0 #### RFC5626 Section 9.5 https://datatracker.ietf.org/doc/html/rfc5626#section-9.5 INVITE must contain `ob;` but does not need to contain `;+sip.instance=...;reg-id=...` ``` INVITE sip:alice@a.example SIP/2.0 From: Bob <sip:bob@example.com>;tag=ldw22z To: Alice <sip:alice@a.example> Call-ID: 95KGsk2V/Eis9LcpBYy3 CSeq: 1 INVITE Route: <sip:ep1.example.com;lr> Contact: <sip:bob@192.0.2.2;transport=tcp;ob> ``` EP1 adds a Record-Route with a flow-token in message #43. ``` Record-Route: <sip:3yJEbr1GYZK9cPYk5Snocez6DzO7w+AX@ep1.example.com;lr> ``` -- Reply to this email directly or view it on GitHub: https://github.com/kamailio/kamailio/issues/3190 You are receiving this because you are subscribed to this thread. Message ID: &lt;kamailio/kamailio/issues/3190(a)github.com&gt;