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===European Telecommunications Standards Institute=== In some countries of [[Europe]], the [[European Telecommunications Standards Institute]] (ETSI) standards 200 778-1 and -2 – replacing 300 778-1 & -2 – allow 3 physical transport layers ([[Telcordia Technologies]] (formerly Bellcore), [[British Telecom]] (BT) and [[Cable Communications Association]] (CCA)), combined with 2 data formats [[Caller ID|Multiple Data Message Format]] (MDMF) & [[Caller ID|Single Data Message Format]] (SDMF), plus the [[Dual-tone multi-frequency]] (DTMF) system and a no-ring mode for meter-reading and the like. It's more of a recognition that the different types exist than an attempt to define a single "standard".
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