A Brief history of ISUP

 


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