[SIPForum-discussion] Need help about the SIP stack

[nikhil subhedar]

Dear All,
Can anyone  give me the information of open source SIP stack?
As of now i am having Blackberry SDK and Windows mobile SDK and i am
suspecting Windows mobuile sdk is already contains the SIP stack.
Apart  from the above mentioned stacks which stack is easy to  learn SIP
protocol?

Thanks  & Regards,
Nikhil Subhedar
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