Dear Chiang, Try the RFC: http://www.faqs.org/rfcs/rfc2617.html If you are doing an open source project, there are many implementation that may be of help: http://www.sipcenter.com/sip.nsf/html/User+Agents,+Source+Code g-)

Also, you may get help from Tan, Chiang Kang wrote:

Hi all, May I know where to find some guidelines on how to implement a UA to do registration with digest authentication? Any links you are aware of will be useful.

cheers Chiang

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