SIP over TCP problem with MSS-initiated requests (NIO sip stack impl)

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What steps will reproduce the problem?
1. Deploy a regular B2BUA, or C2C sip servlet which sends new requests over 
TCP: 
SipURI reqLine = (SipURI) invite.getRequestURI();           
reqLine.setTransportParam("tcp");  
invite.send();
2. Restart MSS and wait for 3-4 minutes without any calls. 
3. Try to send new invite over tcp.

What is the expected output? What do you see instead?
New invite should be send out. It isn't send out, you cannot see it in tcpdump.

What version of the product are you using? On what operating system?
mss-2.0.0.FINAL-jboss-as-7.1.2.Final-1349104459 on Debian 6.0.4 x64

Please provide any additional information below.
The discussion with more details is here: 
https://groups.google.com/d/topic/mobicents-public/IEPUy_H18Eo/discussion

Switching to regular jain-sip-ri without NIO solves the problem.

Original issue reported on code.google.com by kmiodusz...@gmail.com on 4 Mar 2013 at 10:34

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Original comment by jean.deruelle on 5 Jul 2013 at 7:44

• Added labels: MSS-3.0.0.FINAL
• Removed labels: MSS-2.1.0.FINAL

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Can you retry on the latest SNAPSHOT from 
https://mobicents.ci.cloudbees.com/job/Mobicents-SipServlets-Release/lastSuccess
fulBuild/artifact/ and see if that still happens ?

If it does please attach logs with org.mobicents category at DEBUG level

Original comment by jean.deruelle on 30 Apr 2014 at 8:23

• Changed state: Pending
• Added labels: TelScale-7.0.2.GA

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No Update. Closing, please reopen at 
https://github.com/Mobicents/sip-servlets/issues/new if needed

Original comment by jean.deruelle on 17 Dec 2014 at 9:38

• Changed state: Invalid