Christer, I think I already captured that in the statement "Other reasons are topology hiding, media shaping, etc.. Such modification breaks RFC 4474 signatures." If you think that is insufficient, please elaborate reasons, so we get a better understanding of the scope of the problem.
John > -----Original Message----- > From: Christer Holmberg [mailto:[EMAIL PROTECTED] > Sent: 14 March 2008 01:29 > To: Elwell, John; IETF SIP List > Subject: VS: [Sip] SBC impact on RFC 4474 > > Hi, > > SBCs may modify SDP even if ICE is used. > > Regards, > > Christer > > ________________________________ > > Lähettäjä: [EMAIL PROTECTED] puolesta: Elwell, John > Lähetetty: to 13.3.2008 22:27 > Vastaanottaja: IETF SIP List > Aihe: [Sip] SBC impact on RFC 4474 > > > > One of the questions raised at the end of the SIP session > today was the > following: > > "Are there any useful steps for dealing with SDP modification > by SBCs?" > > SBCs modify SDP (and perhaps other signed information in SIP > requests). > One of the reasons is NAT traversal (should not be applicable > with ICE, > but I don't think we can always assume that ICE is used). > Other reasons > are topology hiding, media shaping, etc.. Such modification breaks RFC > 4474 signatures. > > SBCs also sometimes change From URIs in SIP requests, as discussed in > draft-kaplan-sip-uris-change-00. We have taken this into > account during > our various discussions (in the WG and off-line) on the > telephone number > problem, so I want to keep that separate. For this thread, assume an > "email-style" (or non-phone-number-based) From URI that is > not modified > by an SBC. Focus instead on modification of other signed information. > > I would like to hear views on the following: > - The degree to which this is a problem. > - Existing solution proposals: > o draft-wing-sip-identity-media-02 > o draft-fischer-sip-e2e-sec-media-00 > - Other solution proposals. > > John > > _______________________________________________ > Sip mailing list https://www.ietf.org/mailman/listinfo/sip > This list is for NEW development of the core SIP Protocol > Use [EMAIL PROTECTED] for questions on current sip > Use [EMAIL PROTECTED] for new developments on the application of sip > > > _______________________________________________ Sip mailing list https://www.ietf.org/mailman/listinfo/sip This list is for NEW development of the core SIP Protocol Use [EMAIL PROTECTED] for questions on current sip Use [EMAIL PROTECTED] for new developments on the application of sip
