initialize the bridge result to 'no result', so that we can check for code paths that set it to AST_BRIDGE_COMPLETE inside the loop (thanks Oskar!)


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As it turns out, all of these checks were useless, because alloca will never
return NULL.


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update iax2_indicate to pass control frame payload to the connected channel
add an API call for sending an indication with payload, and use it for control frames with payload


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Make sure that we don't accept an answer on an inbound call and don't permit asterisk to answer an outbound call


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support sending control frames with payload


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 Make the "Avoided Initial Deadlock for '....', X retries!" a LOG_DEBUG msg instead of LOG_WARNING as this only has relevance to developers trying to resolve a possible problem. #6949



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that can safely handle a NULL argument.



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Thanks to the fine work of Russell Bryant and Dancho Lazarov, we now have autoconf and menuselect tools for Asterisk!



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  on the frame counters. Document it in the header file.
- provide a single exit point for a function;
- mark XXX some unclear parts of the code.



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wrappers around the basic 'say' functions, and redeclare these
wrappers as ordinary functions rather than function pointers.

This way, alternative implementations of the 'say' functions
will only have to implement the basic functions and not the
wrappers.



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- use ast_channel_lock/unlock in a few places
- comment some dubious pieces of code
- use memset to zero a buffer



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Do not depend on having an end sound for stopping the bridge when time runs out. (issue #6979 reported by ppyy)


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don't transcode via SLINEAR when the option is enabled but there is a direct path from the source to the destination


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function so the flow is easier to follow.



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(the previous version was mine, but this way it is definitely
more readable).



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- handle immediately failures in ast_request();
  This removes the need for checking 'chan' multiple times afterwards.
- handle immediately failures in ast_call(), by moving the one-line
  case at the top of the 'if' statement;
- use ast_strlen_zero in several places instead of expanding it inline;
- make outstate always a valid pointer;
On passing mark an unclear statement and replace a magic number
with sizeof(tmp).



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- bring the short case at the top of an 'if' statement
  (also fix misformatting)
- replace several 'if' with the '?' operator;
 
- invert the condition on an 'if' to reduce the nesting depth 
  (reindentation to be done later).



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Comment a possible problem with locking.



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- New get_sip_pvt_byid function (not really used correctly yet...)


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of their '_full()' version, so we can remove the replicated
implementation and, especially, the risk that they get out of sync.



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- Update lock.h with definitions of ast_channel_lock, ast_channel_unlock and ast_channel_trylock
- Convert some functions (but not all) in channel.c
- Fix some bugs in chan_sip.c
- Convert rest of chan_sip.c


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when you have channel locking issues.
(Part of the SIP transfer patch, where I had a *lot* of
channel locking problems)


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