Is there a way to test a modem?

I have an iMac g4 (with the swivel screen). I have been unable to connect to the internet server lately. The modem dials and starts handshaking and then hangs up before ever reaching the password authentication stage.
Is there a way to verify the modem's capability to connect?
Thanks
Jeff

You may do better to ask in the iMac g4 forum
Do you have a hardware test CD? might be an idea to try that aswell.
--Spire

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