This Recommendation contains the service description of GVNS for the PSTN and ISDN. This Recommendation
defines the service from a user’s perspective. This Recommendation does not specify the requirements where the service
is provided to the user by the private networks; however, it addresses the interworking requirements with private
networks.
This Recommendation is the Stage 1 service description for the ISDN and is applicable to the ISDN Stages 2 and 3
Recommendations for GVNS. The terms Stages 1,2 and 3 are defined in CCITT Recommendation 1.130.
ITU-T F.16-1995 history
1995ITU-T F.16-1995 Global Virtual Network Service Study Group 1; 23 pp