SMG PRI Daemon - PRI Protocol stack

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Author: David Yat Sin <dyatsin@sangoma.com>
Copyright (c) 2009-2010 Sangoma Technologies Inc.
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* Fri Feb 26 2010 David Yat Sin <dyatsin@sangoma.com> - 1.63
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- Revision 15607
- Support for sigboost version 103
- Support for TON/NPI passthrough from sigboost message
- Fix for sending disconnect twice when progress+cause was received
- Added check for boost select socket errors
- Added decoding of Q.931 Sending Complete IE

* Fri Feb 26 2010 David Yat Sin <dyatsin@sangoma.com> - 1.53
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- Revision 15288
- Support for sigboost version 102
- Different pathcs for Boost priority and boost normal messages implemented
- Fix for sending CALL_START_NACK after sending a CALL_START_ACK when a call
proceed is received followed by a Disconnect
- Fix for false error printing "Inconsistent span chan"
- Merged changes from Netborder Gateway code
- Allows for 4 heartbeats before assuming user application is dead
- Fixed issue where sangoma_prid would leave some ghost calls when restarting
- Support for disconnecting only when receiving Progress + certain causes.



* Wed Jan 13 2010 David Yat Sin <dyatsin@sangoma.com> - 1.33 
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- Revision 14778
- Fix for sending Display IE on NI-2 (did not match NI-2 specs)
- Fix for segfault when sending Call Proceed on 64-bit kernels
- TSoft event handlers now use reference instead of pointers
- Fix for prepending calling number on incoming calls
- Fix for parameters in call progress boost message not initialised
- Fix for not enabling all b-channels on start due to event queue full.
- Fix for sending boost CALL ANSWERED without sending CALL_PROGRESS with media enabled in some cases
- Fix for sending call answered with smg_id not initialized to 0.
- InBoundEarlyMediaMode and OutBoundEarlyMedia mode implemented 
- Added sending call progress on incoming calls when early media enabled
- Support for sending progress indicator in outgoing calls


* Fri Nov 27 2010 David Yat Sin <dyatsin@sangoma.com> - 1.19
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- Revision 14262
- Support for early media mode
- Fix for call_setup_id sometimes undefined
- Implemented common parth for Progress, Alert and Proceed
- Fix for stack going into unpredictable state if system time is changed
- Fix for cases where b-channel lock was not released, causing deadlock
- Removed Apr dependency

