Review Board 1.7.16

Reference Count Handling of SIP dialogs in Session Timer Processing

Review Request #17 - Created Oct. 31, 2008 and submitted

Russell Bryant
I have been working on another reference count handling audit in chan_sip.  I have found a number of problems.  Some I have already fixed.  Some I have documented.

This patch addresses the lack of reference counting on the sip_pvt structure for scheduler entries related to SIP session timer processing.  I think I've got it right, but a sanity check would be good, as I wrote this at an insane hour in the morning.
The "make" test passed
Review request changed
Updated (Dec. 16, 2008, 2:09 a.m.)
Just removing the "digium_swdev" group from this review so that I can delete the group. runs on a server provided by Digium, Inc. and uses bandwidth donated to the open source Asterisk community by API Digital Communications in Huntsville, AL USA.
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