Thanks, Sumit. I understood below:
An INVITE request (from a UAC) before 407 response has "Route" header as path to a UAS. So when the UAC receive 407 response, the UAC can guess the originator of the 407 using "Route" header in the above INVITE request. Is the above correct? 2010/2/10 sumit jindal <[email protected]>: > Hi , > > The request will take that path itself , like some new request. > > Regards, > Sumit Jindal > > On Wed, Feb 10, 2010 at 5:24 PM, Couret Tabt <[email protected]> wrote: >> Thank you, Castillo. >> >> I mean below: >> >> A UAC can NOT know an originator of 407. >> But UAC can send back INVITE to the originator of 407. >> Why? >> >> >> 2010/2/10 Iñaki Baz Castillo <[email protected]>: >>> El Miércoles, 10 de Febrero de 2010, Couret Tabt escribió: >>>> Thank you, Castillo. >>>> >>>> At 3.2 in RFC3665, F2 407 is below: >>>> >>>> F2 407 Proxy Authorization Required Proxy 1 -> Alice >>>> >>>> SIP/2.0 407 Proxy Authorization Required >>>> Via: SIP/2.0/TCP client.atlanta.example.com:5060;branch=z9hG4bK74b43 >>>> ;received=192.0.2.101 >>>> From: Alice <sip:[email protected]>;tag=9fxced76sl >>>> To: Bob <sip:[email protected]>;tag=3flal12sf >>>> Call-ID: [email protected] >>>> CSeq: 1 INVITE >>>> Proxy-Authenticate: Digest realm="atlanta.example.com", qop="auth", >>>> nonce="f84f1cec41e6cbe5aea9c8e88d359", >>>> opaque="", stale=FALSE, algorithm=MD5 >>>> Content-Length: 0 >>>> >>>> In the above, there is no "Contact" header . >>> >>> Of course, 4XX responses have no Contact as it's useless. >>> >>> >>>> So I think Alice can NOT know even the full host name of Proxy1 >>>> (ss1.atlanta.example.com). >>> >>> Alice doesn't know if the 407 comes from P1, P2 or whatever as Alice where >>> P1 >>> relayed the requests. >>> >>> >>> >>>> But Alice(UAC) can resend INVITE to the originator(Proxy1) >>>> at F4 INVITE. >>>> Why can Alice(UAC) do so? >>> >>> This is basically as Digest authentication works in SIP. Not sure if I >>> understand what you mean in this last question. >>> >>> >>> >>> -- >>> Iñaki Baz Castillo <[email protected]> >>> >>> _______________________________________________ >>> Sip-implementors mailing list >>> [email protected] >>> https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors >>> >> >> _______________________________________________ >> Sip-implementors mailing list >> [email protected] >> https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors >> > > > > -- > Regards, > Sumit Jindal > _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
