Asterisk versions not compatible with MOR

1.4.19.x/1.4.20.x

Crashes when realtime SIP peer is dialing: http://lists.digium.com/pipermail/asterisk-users/2008-April/209342.html and http://bugs.digium.com/view.php?id=12362

1.4.21.x

• Locks and does not respond: http://bugs.digium.com/view.php?id=12925
  • 1.4.21.1 has fixed this problem, but next problem does not allow to use this Asterisk version
• Realtime broken: http://bugs.digium.com/view.php?id=12921

Usable versions with MOR

• 1.4.18.1