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"dial-up internet via the cable modem"?
Cable Modems are completely seperate from the phone line... you're either connected to a cable modem or a regular dialup modem...
If you're talking about just dial-up internet, and you want to know if you can dial your ISP from a phone line other than your own, then in most cases, the answer will be yes, you can.
(It's possible that your ISP could use CLI and block calls not coming from your phone line, but this is very unlikely)
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