Question

What is the full form of STD and ISD?

Answer 1

Answer:

STD= subscriber trunk dialer. ISD= International subscriber dialing.

Explanation:

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Answer 2

Explanation:

STD - Subscriber Trunk Dialling - STD, also known as the subscriber toll dialling is a telephone system that allows the subscribers to dial the trunk calls without the assistance of an operator. The term was introduced after it first became to do long-distance calls that could be dialled directly, and is now used as and when calls to any destination can be dialled.

ISD - Input service distributor - An (ISD) is a business receiving invoices for the services that are being used by its branches. An ISD system distributes the taxes paid, to these branches on the proportional basis after issuing an ISD invoice.