ITU-T I.251.1 (REV 1) SPANISH-1992
Direct-Dialling-in Study Group I

Standard No.

ITU-T I.251.1 (REV 1) SPANISH-1992

Release Date

1992

Published By

International Telecommunication Union (ITU)

Latest

ITU-T I.251.1 (REV 1) SPANISH-1992

Scope

This supplementary service will be based on the use of the (ISDN) number. At least a significant part of the ISDN number will be transferred to the private ISDN in order to route the call to its destination. Direct-dialling-in (DDI) will apply to public ISDNs with closed or open numbering plan.

ITU-T I.251.1 (REV 1) SPANISH-1992 history

• 1992 ITU-T I.251.1 (REV 1) SPANISH-1992 Direct-Dialling-in Study Group I