[Sip-implementors] Why does SIP use hop-to-hop authentication?

[Jerry Ipe Thomas]

Dear Mr.Schulzrinne, Why was hop-to-hop authentication chosen for SIP? Why not like HTTP/1.1? The problem here is that UAs that do not have lots of memory to cache credentials may not be able to handle multiple authorization header caching. Why must the user agent bother to authenticate with servers at every hop since he has already authenticated with his proxy? I hope I am not wrong about this. Am I? Regards,   Jerry Ipe Thomas Trainee Engineer(R&D) D-Link India Ltd. Software and R&D Center #65, 35th Main, 100ft. Ring Road, 2nd Stage, B.T.M Layout, Bangalore-560068 Tel: +91-80-26788350/51 Extn: 117

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