Naveen Albert ccdcc18dec 
	
	
	sig_analog: Add Call Waiting Deluxe support. ... 
			Adds support for Call Waiting Deluxe options to enhance
the current call waiting feature.
As part of this change, a mechanism is also added that
allows a channel driver to queue an audio file for Dial()
to play, which is necessary for the announcement function.
ASTERISK-30373 #close
Resolves : #271 
UserNote: Call Waiting Deluxe can now be enabled for FXS channels
by enabling its corresponding option.
(cherry picked from commit 876c25a953 
		
	 
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