_________________      ___________________      _______
Call --->| String-switch   |    | location          |    | proxy |---------\
         |   field: from   |  ->|   url: sip:jones@ |--->|       | busy    |
         |-----------------| /  |     example.com   |    |       |---------|
         | match:          |/   |___________________|    |       | timeout |
         |   *@example.com |                             |_______|---------|
         |-----------------|                                       failure |
         | otherwise       |   ____________________________________________/
         |                 |\ /  ____________________ 	   __________
         |_________________| \| | location           |	  | redirect |
                              ->|   url: sip:jones@  |--->|	     |
                                |        voicemail.  |	  |__________|
                                |        example.com |
                                |   merge: clear     |
                                |____________________|