Split Hold event into Hold/Unhold, and move it into core.

(closes issue ASTERISK-21487)
Review: https://reviewboard.asterisk.org/r/2565/


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@389746 65c4cc65-6c06-0410-ace0-fbb531ad65f3

include/asterisk/channel.h

@@ -1202,6 +1202,31 @@ int ast_queue_hangup(struct ast_channel *chan);
  */
 int ast_queue_hangup_with_cause(struct ast_channel *chan, int cause);
 
+/*!
+ * \brief Queue a hold frame
+ *
+ * \param chan channel to queue frame onto
+ * \param musicclass The suggested musicclass for the other end to use
+ *
+ * \note The channel does not need to be locked before calling this function.
+ *
+ * \retval zero on success
+ * \retval non-zero on failure
+ */
+int ast_queue_hold(struct ast_channel *chan, const char *musicclass);
+
+/*!
+ * \brief Queue an unhold frame
+ *
+ * \param chan channel to queue frame onto
+ *
+ * \note The channel does not need to be locked before calling this function.
+ *
+ * \retval zero on success
+ * \retval non-zero on failure
+ */
+int ast_queue_unhold(struct ast_channel *chan);
+
 /*!
  * \brief Queue a control frame without payload
  *

include/asterisk/stasis_channels.h

@@ -339,6 +339,22 @@ struct stasis_message_type *ast_channel_dtmf_begin_type(void);
  */
 struct stasis_message_type *ast_channel_dtmf_end_type(void);
 
+/*!
+ * \since 12
+ * \brief Message type for when a channel is placed on hold.
+ *
+ * \retval A stasis message type
+ */
+struct stasis_message_type *ast_channel_hold_type(void);
+
+/*!
+ * \since 12
+ * \brief Message type for when a channel is removed from hold.
+ *
+ * \retval A stasis message type
+ */
+struct stasis_message_type *ast_channel_unhold_type(void);
+
 /*!
  * \since 12
  * \brief Message type for when a channel starts spying on another channel