Where can I find the native c,c++ code of ngn stack for imsdroid

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What steps will reproduce the problem?
1. Make a video call using imsdroid client version 2.x
2. Observe the length of the INVITE being sent its around 2000 bytes.
3. How to we get access to the native ngn stack code so that we can reduce the 
length of INVITE msg by removing some of the optional media information. 

What is the expected output? What do you see instead?
Where can I find the native code for the ngn sip stack.

What version of the product are you using? On what operating system?
Imsdroid 2.0

Please provide any additional information below.

Original issue reported on code.google.com by deepali....@gmail.com on 6 Dec 2012 at 7:42

yuanjianjiang / imsdroid

Where can I find the native c,c++ code of ngn stack for imsdroid #421