Inbound Calls not receiving on IMSDROID

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What steps will reproduce the problem?
1.I configure the ImsDroids, it gets register with Asterisk 
2.When I make calls to other Zoiper client it works perfectly
3.But When I dial IMSDRID extension call receives randomly, some time works 
some time does not work .. most of the time no incoming call on IMSDROID
4. It gets Unregster from Server but reason not found 

What is the expected output? What do you see instead?

What version of the product are you using? On what operating system?
I using IMSDROID katest version which was uploaded on Feb11.

Please provide any additional information below.

Original issue reported on code.google.com by mimran.i...@gmail.com on 17 Feb 2015 at 6:40

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4. I think It gets Unregster from Server but reason not found

Original comment by mimran.i...@gmail.com on 17 Feb 2015 at 6:42