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git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@3246 d0543943-73ff-0310-b7d9-9358b9ac24b2

This modification makes it possible to change the media path of session in the switch on-the-fly and from the dialplan.
It adds some API interface calls usable from a remote client such as mod_event_socket or the test console.

1) media [off] <uuid>

   Turns on/off the media on the call described by <uuid>
   The media will be redirected as desiered either into the switch or point to point.

2) hold [off] <uuid>

   Turns on/off endpoint specific hold state on the session described by <uuid>

3) broadcast <uuid> "<path>[ <timer_name>]" or "speak:<tts_engine>|<tts_voice>|<text>[|<timer_name>]" [both]

   A message will be sent to the call described by uuid instructing it to play the file or speak the text indicated.

   If the 'both' option is specified both ends of the call will hear the message otherwise just the uuid specified
   will hear the message.

   During playback when only one side is hearing the message the other end will hear silence.

   If media is not flowing across the switch when the message is broadcasted, the media will be directed to the
   switch for the duration of the call and then returned to it's previous state.


Also the no_media=true option in the dialplan before a bridge makes it possible to place a call while proxying the session
description from one endpoint to the other and establishing an immidiate point-to-point media connection with no media
on the switch.

<action application="set" data="no_media=true"/>
<action application="bridge" data="sofia/mydomain.com/myid@myhost.com"/>


*NOTE* when connecting two outbound legs by using the "originate" api command with an extension that has no_media=true enabled,
the media for the first leg will be engaged with the switch until the second leg has answered and the other session description
is available to establish a point to point connection at which time point-to-point mode will be enabled.

*NOTE* it is reccommended you rebuild FreeSWITCH with "make sure" as there have been some changes to the core.



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update to new sofia snapshot.  This fixes several race conditions, ref count problems, and double frees that were happening in the sofia library and fixes segfaults under heavy load and a segfault on cancel when using 100rel while awaiting a prack.  Sofia should be much more stable now, please beat it up and let us know.

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make sofia a bit more stable after an outbound register.  Please note, we are working on some issues in sofia, revisions after last weekend are currently not considered stable under some conditions.

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