Regional Differences
Different countries often use different standards for transmitting caller ID. As a result, phones purchased in one country may not be compatible with the caller ID standard use when the phone is used in a different country. For example, US uses Bellcore FSK whereas Taiwan uses ETSI FSK so a phone purchased in the US will not understand Taiwan's caller ID standard. There are even cases where individual state/provinces will use different protocols within a country. There do exist, however, caller ID converters that will translate from one standard to another. Below is a list of countries and the caller ID standard used:
| Country | Caller ID standard |
|---|---|
| United States | Bellcore FSK |
| Canada | Bellcore FSK |
| China | Bellcore FSK |
| Hong Kong | Bellcore FSK |
| Ireland | ETSI FSK V23 (ETS 300 659-1) Ring Pulse Alert Signalling. Data sent after first short ring. |
| Taiwan | DTMF / ETSI FSK |
| United Kingdom | SIN227 (V23 FSK before first ring) |
| Japan | V23 FSK / DTMF |
| Spain | ETSI FSK |
| Brazil | Bellcore FSK / V23 FSK / DTMF |
| Norway | ETSI FSK |
| New Zealand | Bellcore FSK |
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