--
-- This DSM app
-- o plays early media from a file in the DB
-- o sends a HTTP request to a web server
-- o SUBSCRIBEs to registration state
-- o if registration becomes active (at least one active contact), it sends back "300 Multiple Choices"
-- o otherwise (timeout) it sends back "480 Not found"
-- Parameters (P-App-Param):
-- audio_id - indicating audio file in DB
-- expiration - subscription expiration/waiting time (default: 60)
-- caller - caller passed to notification web app
-- callee - callee passed to notification web app
-- domain - domain passed to notification web app
--
-- Example: P-App-Param: audio_id=rbt;expiration=30;caller=+43111111111;callee=+432222222222;domain=sip.sipwise.com
--
-- Example DB:
-- CREATE TABLE `audio_files` (
-- `id` varchar(20) DEFAULT NULL,
-- `data` mediumblob
-- ) ENGINE=MyISAM DEFAULT CHARSET=latin1;