This function speaks text or a WAV file over the phone line given.
Parameter: Line
Type: Integer
Description: The phone line to speak to.
Parameter: Text
Type: String
Description: The text to speak. This may also be the full path to a WAV
file to play over the phone.
Parameter: Wait
Type: Boolean
Description: Boolean value that causes the function to not return if set
to TRUE. If set to FALSE, the speaking text is queued and the function
returns immediately.
None.