asterisk prompt recording.

[recordings]exten => 500,1,Background(to-rerecord-yr-message)exten => 500,2,Record(mymessage:gsm)exten => 500,3,Playback(mymessage)exten => 500,4,Background(if-correct-press)exten => 500,5,Background(press-1)exten => 500,6,Background(otherwise-press)exten => 500,7,Background(digits/2)exten => 500,8,ResponseTimeout(3)exten => t,1,Background(invalid)exten => t,2,Goto(500,3)exten => i,1,Background(invalid)exten => i,2,Goto(500,3)exten => 1,1,System(/bin/mv /var/lib/asterisk/sounds/mymessage.gsm /var/lib/asterisk/sounds/local/${TIMESTAMP}.gsm)exten => 1,2,Goto(500,1)exten => 2,1,Goto(500,1)