Caller ID in the USA uses the FSK standard. For the most part, caller ID in India uses DTMF (although I have heard of some FSK usage).
I am currently living in New Delhi and have an Airtel home phone line. My switch uses DTMF. I went to the Palika electronics bazaar (I aways use shop number 266 near gate 5, they seem to be a little kinder to foreigners as far as the "final price") and purchased an DTMF to FSK convertor. My US phones now show caller ID information, although using US number seperations ### - ### - ####. I paid R500 but you could probably get it for around R400 if you are willing to put in the time bargaining. It looks like they are also available on
Indian Ebay.
Mine says UST001B. It looks like these are low volume items because they stuck the components into a box marked "DSL Splitter" It works to convert the caller ID as advertised.
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