ASUS ROG GL753VE - 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

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 multi-frequency signalling.