DeRegisterType table in Skype for Business Server 2015

The DeRegisterType table is a static table that stores the list of possible user deregisters types, such as 'client initiated,' 'registration expired,' or 'client stopped responding.'

Column Data Type Key/Index Details
DeRegisterTypeId
tinyint
Primary
DeRegisterReason
nvarchar(256)
Allowed values:
0--Unknown
1--Client Initiated Deregistration
2--Registration Expired
3 - Client crashed
4--User Attributes Changed
5 - Preferred Registrar Changed
6--Legacy Client In Survival Mode