Public Switched Telephone Network (PSTN) - Subscriber Line Protocol Over the Local Loop for Display (and Related) Services - Part 1: On Hook Data Transmission
Definition of the protocol for on hook data transmission on analogue lines required to support display services such as Calling Line Identification Presentation for the PSTN.
Universal Personal Telecommunication (UPT) - UPT Phase 2 - Functional Specification of the Interface of a UPT Integrated Circuit Card (ICC) and Card Accepting Devices (CADs) - UPT Card Accepting Dual Tone Multiple Frequency (DTMF) Device