[sr-dev] Sec agree support in P-CSCF modules

Hello! I am working on Kamailio based IMS setup. During testing I noticed that the UE sends unprotected register, challenge is returned but after that the UE doesn't attempt to send REGISTER with authentication data. I believe this happens due to the lack of support of sec-agree extension in Kamailio. After a short google search I found this thread: https://www.mail-archive.com/sr-users@lists.sip-router.org/msg29269.html After that I spoke with miconda in IRC, he confirmed that no one works on this and suggested to ask for help in this mail list. So in nutshell - I believe without this feature (correct me if I am wrong) a real UE can't attach to Kamailio based IMS setup. I am willing to work on it, but I need some guidance. Is there someone willing to help me with advice how to fit this feature in the whole project? At the moment my concerns are: - Is this feature really needed in real LTE network? - Is there a vision how this feature should be implemented in the Kamailo landscape? E. g. as separate module, as part of ims_usrloc_pcscf / ims_registrar_pcscf? What ipsec library to use? Best regards, Tsvetomir