...
a-z, A-Z, 0-9
! $ & ' ( ) * + , ; =
However, there are a few vendor-dependent differences:
Axis
Supported characters are:
a-z, A-Z, 0-9
! @ # $ % ^ & * ( ) _ - + = { } [ ] | ; : < > . , ? /
Hanwha
Supported characters are:
a-z, A-Z, 0-9
! @ # $ % ^ & * ( ) _ - + = { } | ; : < > . ? /