ASUS ROG G750JZ - Overview

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On 4th August 1998 the European Council Decision regarding

the CTR 21 has been published in the Official Journal of the

EC. The CTR 21 applies to all non voice terminal equipment

with DTMF-dialling which is intended to be connected to the

analogue PSTN (Public Switched Telephone Network).
CTR 21 (Common Technical Regulation) for the attachment

requirements for connection to the analogue public switched

telephone networks of terminal equipment (excluding terminal

equipment supporting the voice telephony justified case

service) in which network addressing, if provided, is by means of

dual tone multifrequency signalling.