+------------+
|endpoint    |
|            +--------------> +---------+
|            |                |         |
+------------+                | freeswitch  PSTN            +------+
                              |         +------------------->      |
                              |         |                   | endpoint
                  dialplan options:-----+   plays selected  |      |
                  1. foo.wav                file from dialplan-----+
                  2. bar.wav
                  3. foobar.wav
                  4. barfoo.wav