hi, inline.
----- Original Message ----- From: "Scott Lawrence" <[EMAIL PROTECTED]> To: "wendy" <[EMAIL PROTECTED]> Cc: <[EMAIL PROTECTED]> Sent: Wednesday, October 29, 2003 9:10 PM Subject: [Sipping] Re: about digest authentication > "wendy" <[EMAIL PROTECTED]> writes: > > > I meet a trouble when developping a b2bua as a SIP ALG to traverse NAT. > > This question would be more appropriately asked on > [EMAIL PROTECTED] (questions on current sip) > > > The network topology is like this: > > > > private UA --- SIP ALG --- SIP Server (public) > > > > When the private UA registers to the SIP Server, > > the SIP ALG can forward authentication CHALLENGE from the SIP Server to the > > private UA, > > and forward authentication RESPONSE from the private UA to the SIP Server. > > > > In some cases, e.g. the public IP address of the SIP ALG is changed, > > I hope the SIP ALG can initiate a registration as a substitute of the > > private UA. > > Thus, the private UA does not need to care the SIP ALG's changes. > > But how can the SIP ALG be authenticated successfully, > > if the administrator of the SIP ALG does not want to configure manually the > > usernames/passwords of all private users? > > What changes do you want to make in the ALG that would invalidate the > authentication parameters? > Here, there are 2 kinds of registration. The first is initiated by the private UA. The To header field contains the private user's AOR. The ALG modifies the Contact header field and forwards the SIP messages. The second is initiated by the ALG. The To header field also contains the private user's AOR. But the private UA does not sense the registration procedure. If the administrator does not set any necessary authentication parameter in the ALG in advance, can the ALG get necessary authentication parameters during the first kind of registration and use these parameters to implement the second kind of registration sometime in the future? > -- > Scott Lawrence > Pingtel Corp. > > > _______________________________________________ > Sipping mailing list https://www1.ietf.org/mailman/listinfo/sipping > This list is for NEW development of the application of SIP > Use [EMAIL PROTECTED] for questions on current sip > Use [EMAIL PROTECTED] for new developments of core SIP Thanks! regards, Wendy _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
