"final response already sent" exception thrown when creating a cancel after a 407 response

[GoogleCodeExporter]

What steps will reproduce the problem?
1.User A makes a call to user B. Invite is created and sent.
2.407 received.
3.New Invite is created with proxy-authorization header.
4.User A wants to cancel the call. 

What is the expected output? What do you see instead?
Cancel should be created and sent. Instead, following exception is thrown: 
"java.lang.IllegalStateException: final response already sent : SIP/2.0 407 
Proxy Authentication Required" from SipServletRequestImpl.createCancel().

What version of the product are you using? On what operating system?
1.5 Linux

Please provide any additional information below.

This was reported before(issue 1816) and it was fixed in 1.4 but problem 
continues.  

Issue 1816: https://code.google.com/p/mobicents/issues/detail?id=1836

Original issue reported on code.google.com by yoncaust...@gmail.com on 18 Jul 2013 at 7:13

[GoogleCodeExporter]

1.5 is not supported in communty anymore.
Please check on latest snpashots from 
https://mobicents.ci.cloudbees.com/job/Mobicents-SipServlets-Release

Original comment by jean.deruelle on 18 Jul 2013 at 9:15

[GoogleCodeExporter]

Marking as invalid until tested against latest snapshot

Original comment by jean.deruelle on 18 Apr 2014 at 10:25

• Changed state: Invalid

[GoogleCodeExporter]

Original comment by jean.der...@telestax.com on 25 Aug 2014 at 10:53

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