What syntax to connect modem at command line?

A while ago, I posed this question to the PLUG list,
but never received a reply. Can anyone help now?

What is the correct syntax to connect a modem at the command line?
And how does one find which tty has the modem connected?

In the past, I have used the following on a previous system, but it does
not work on my current system:

cu -lttyS1 ###-###-####
(substituting the correct phone number for ###)

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