ASUS ROG G550JX - 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.