Hello Roland, That's a pretty tough question you asked =) Okay I'll try my best to not forget one :) If we start from this reference : http://www.pjsip.org/sip_media_features.htm#sip_features all those features are needed for an IMS Client. The one that should be supported as well are : RFC3321 and RFC3322 for Signaling Compression RFC3323 about the Private Field for privacy RFC3325 (very important) Private Extensions to SIP for Asserted Identity within Trusted Networks RFC3329 Security between the UA and First hope RFC3455 Private Header (P-Header) Extensions to SIP for the 3GPP RFC3486 Compressing SIP (for SigComp) RFC3892 should be fully supported for Session Mobility RFC4083 is interesting as well, describing the requirement of SIP by the 3GPP That's it I think. I've based this list on this page http://www.tech-invite.com/Ti-sip-RFCs.html. If anything else comes to my mind, I'll complete the list. Regards, Olivier B. Roland Klabunde a ?crit : > Hi Oliver, > > I'm just curious: Besides the Digest-AKA, which has been integrated to PJSIP > by Benny, and the remarks you sent in your mail: What RFC's would you > consider to be "mandatory for PJSIP" in order to evolve to a IMS compliant > UA? > > Regards > > > _______________________________________________ > Visit our blog: http://blog.pjsip.org > > pjsip mailing list > pjsip at lists.pjsip.org > http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org -- Olivier Beytrison Telecommunication Engineer Mobile: +41 (0)78 619 73 53 Mail: olivier at heliosnet.org GPG: 0x4FB83528 http://pgp.mit.edu/