added DSM app to play file in early media

--
-- This DSM app
--   o plays early media from a file in the DB
--   o replies with final reply code/reason from P-App-Param
--
-- Parameters (P-App-Param):
--    audio_id   - indicating audio file in DB; must be wav 16 bit pcm format (with wav header)
--    fr_code    - final reply code
--    fr_reason  - final reply reason
--
--  Example: P-App-Param: audio_id=rbt;fr_code=404;fr_reason="Not found"

DB table is provisioning.audio_files, select by id, e.g.
+-------+-------------+------+-----+---------+-------+
| Field | Type        | Null | Key | Default | Extra |
+-------+-------------+------+-----+---------+-------+
| id    | varchar(20) | YES  |     | NULL    |       |
| data  | mediumblob  | YES  |     | NULL    |       |
+-------+-------------+------+-----+---------+-------+

apps/early_dbprompt/early_dbprompt.dsm

@@ -0,0 +1,65 @@
+--
+-- This DSM app 
+--   o plays early media from a file in the DB
+--   o replies with final reply code/reason from P-App-Param
+--
+-- Parameters (P-App-Param):
+--    audio_id   - indicating audio file in DB; must be wav 16 bit pcm format (with wav header)
+--    fr_code    - final reply code
+--    fr_reason  - final reply reason
+--
+--  Example: P-App-Param: audio_id=rbt;fr_code=404;fr_reason="Not found"
+
+import(mod_utils);
+import(mod_dlg);
+import(mod_mysql);
+
+initial state START;
+
+transition "DB exception" START - exception / {
+  log(1, "Error in initializing :");
+  logAll(1);
+
+  -- reply with fr_code/reason immediately 
+  dlg.reply($fr_code, $fr_reason);
+
+  -- alternatively, reply with 500:
+  -- dlg.reply(500, "Server Internal Error");
+  stop(false);
+} -> END;
+
+transition "invite" START - invite / {
+  if test($audio_id != "") {
+    mysql.connect();
+    throwOnError();
+    -- play waiting file from DB
+    mysql.playDBAudio(SELECT data FROM provisioning.audio_files WHERE id="$audio_id", rbt.wav);
+    throwOnError();
+    mysql.disconnect();
+  }
+
+  -- send 183 with early media
+  dlg.acceptInvite(183, "Progress");
+
+  -- no default 200 OK
+  set($connect_session=0);
+
+  -- start RTP processing 
+  connectMedia();
+} -> WAITING;
+
+state WAITING;
+
+transition "CANCEL received" WAITING - hangup / {
+  dlg.reply(487, "Request Terminated");
+  removeTimers();
+  stop(false);
+} -> END;
+
+transition "end of prompt" WAITING - noAudio / {
+  dlg.reply($fr_code, $fr_reason);
+  removeTimers();
+  stop(false);
+} -> END;
+
+state END;

apps/early_dbprompt/etc/early_dbprompt.conf

@@ -0,0 +1,20 @@
+
+# configuration for early_dbprompt app
+
+# DSM configuration
+diag_path=/usr/lib/sems/early_dbprompt 
+mod_path=/usr/lib/sems/plug-in/
+load_diags=early_dbprompt
+register_apps=early_dbprompt
+run_invite_event=yes
+set_param_variables=yes
+
+# application configuration:
+
+# database connection:
+db_url="mysql://root:frafos@localhost/provisioning"
+
+
+# local testing:
+#diag_path=../apps/early_dbprompt
+#mod_path=../apps/dsm/mods/lib