try out new builtin RTP using srtp lib

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@1012 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/applications/mod_playback/mod_playback.c

@@ -64,6 +64,8 @@ static void playback_function(switch_core_session *session, char *data)
 	channel = switch_core_session_get_channel(session);
     assert(channel != NULL);
 
+	switch_channel_answer(channel);
+
 	if (switch_ivr_play_file(session, NULL, file_name, timer_name, on_dtmf, NULL, 0) != SWITCH_STATUS_SUCCESS) {
 		switch_channel_hangup(channel);
 	}