Hello Experts, I'm working on a problem related to call transfer using REFER scenario. Messages flow looks like the following: GW1 GW2 GW3 INVITE (SDP) ---------------> ... 200 OK (SDP) /*let's call it dialog [2-3]*/ <--------------- ACK ---------------> GW2-GW3 media <==============> ...... /*GW1 initiates slow start call to GW2*/ INVITE (w/o SDP) ---------------------> 100 Trying <--------------------- REFER (Refer-to: GW3, w/Replaces: [2-3]) <--------------------- 202 Accepted ---------------------> /*GW1 sends slow start INVITE w/Replaces to GW3*/ INVITE w/Replaces [2-3](w/o SDP) ----------------------------------------> .....
The question is: Doesn't issuing REFER contradicts to any RFC in such a case? I've run through some of the documents such as RFC3515 and RFC3891, but have not found any restriction w.r.t. issuing of REFER until 200 OK is received. Maybe I miss something? Really appreciate if someone could help me with this question. Thanks in advance, Alexey Entsov mailto:[email protected] _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
