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Yes you can get stand alone caller ID units, they simply plug into the main line in phone jack. BTW, If you have a modem in your PC you can also then use it as a telephone "anything" Call center, answer-phone, voice-mail, and of course Caller ID. A lot of the software is freeware available on the 'net for download and install.
I was using this site while trouble shooting this in the US...
If the customer has DSL with filters in the same system go back to the NID and Isolate the DSL,
test the caller id and call waiting caller id. If this works you have Data Bleed coming from the DSL.
Make sure there are not two sets of filters on the line. Tjis customer had a filter with the DSL modem.
Doing this we just fixed an on going problem for a field tech who was the second callout on a customer issue.