IMSDROID Client sending 180 instead of 183 even if precondition and 100 rel are present

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What steps will reproduce the problem?
1.A and B client register on OPENIMS
2.A calls B 
3.

What is the expected output? What do you see instead?
The exepected output is that the B party which is also IMSdroid sends 180 
ringing instead of 183 session in progress even if the INVITE towards B party 
contains precondition and 100 rel in supported header.
In attached traces, 
172.21.183.254 IP contains both A party and B party
172.21.183.229 IP is OpenIMS
172.21.183.145 is Application server

What version of the product are you using? On what operating system?
I have tried with both versions 2.548.870 and 2.544.836. but same issye

Please provide any additional information below.

Original issue reported on code.google.com by [email protected] on 9 Mar 2015 at 1:32

Attachments:

• AtoB_basic_call_Volte.pcap