HI friends

I would like to have some information on SIP Stack and have these questions
 
Q    Technically speaking what is involved in developing these stacks?
Q    What are the requirements and pre-requisites?
 
Q    What is the order of development, where to start?

Q    What are the languages and tools used to develop sip stack?

Q    Which application developers to team with for this?

 Q    What are the o/s preferences and what is the present interop state? 

Q    What shortcomings do you observe in sip in its present state

Q    What are my costs for developing these stacks? 

Q    What are the Interoperability issues? Is that my concern at the moment.

Q    What are the factors driving the SIP deployment, timescale

Q    Where is SIP going to be mostly used: call management/signaling, or termination/origination, or both?

Plz help me in giving links, resources and answers releated to SIP STACKS...

Your effort will be appreciated

With warm regards!
SAM

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