ASUS ROG G750JM - 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.