empty to 33

Normal class cause values

• 12, 14, 15, 24

unassigned

34 to 48

Resource-unavailable class cause values

• 36, 48

unassigned

49 to 64

Service or Option-not-available class cause values

• 55, 60, 64

unassigned

65 to 80

Service or Option-not-implemented class cause values

• 67, 68, 71-78, 80

unassigned

81 to 95

Invalid-message class cause values

• 92-94

unassigned

96 to127

Protocol-error class cause values

• 104-109, 116-126

unassigned