The first ISUP Standard was published in 1984
in what was known as "Red Book".
Next came Blue Book in 1988
Then shortly after Blue Book came Q.767 a cut down
version for the International Network
ETSI V1 is ITU Q.767 with very few changes
Next Came ISUP 92 (Actually published in 1993) Adds Compatibility Mechanism
ETSI V2 is based on ISUP 92 minus National options (@)
UK ISUP V1 was never Published, but was based on ETSI V2
ISUP 97
ETSI V3 is ISUP 97 plus CCNR & VPN support minus National options
UK ISUP V2 is based on ETSI V3
ISUP 2000
ETSI V4
UK ISUP V3