International Subscriber Trunk Dialing

Views Updated: Dec 15, 2025

Key Facts

Abbreviation

ISTD

Pronunciation

/ˌɪnərˈnæʃənɑl səbˈskraɪbər trəŋk ˈdaɪəlɪŋ/

Category

Computing

Related Field

Telecom

Other meanings of ISTD

Imperial Society of Teachers of Dancing Community

International Society of Typographic Designers Business

Information Systems Technology and Design Computing

Instrument Systems and Technology Division Computing

Indian Society for Training Development Academic

International Society for Trainers and Developers Academic

In Situ Thermal Desorption Misc