ISO/IEC 21889:2001 Preview
Information technology -- Telecommunications and information exchange between systems -- Private Integrated Services Network -- Inter-exchange signalling protocol -- Call Identification and Call Linkage Additional Network Feature
This standard was last reviewed and confirmed in 2006. Therefore this version remains current.
The electronic version of this International Standard can be downloaded from the ISO/IEC Information Technology Task Force (ITTF) web site
Buy this standard
A standard is reviewed every 5 years
Revisions / Corrigenda