If offset is provided then the audio will seek to sample offset before play starts.
Returns 0 if playback completes without a digit being pressed, or the ASCII numerical value of the digit if one was pressed, or -1 on error or if the channel was disconnected.
Remember, filename follows the same conventions and uses the same file path as dialplan applications like Playback or Background. The file extension must not be included in the filename. @author srt @version $Id$
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