Caller ID on the Plain Old Telephone System



Switzerland
http://supportcommunity.swisscom.ch/t5/Swisscom-Services-Products/Caller-ID-technology/td-p/22307

Hello skywalkerluke,
In Switzerland we use the FSK technology to send the Caller-ID during the 5 seconds between the first to the second tone.

Kind regards,
Swisscom
NunoP



Sweden
http://www.tapiex.com/help/faqcallerid.htm
An esoteric DTMF system is used in Finland, Denmark, Iceland, the Netherlands, Sweden, Brazil, Saudi Arabia and Uruguay.

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