Test it using something like kppp or minicomm. Try out various serial devices (/dev/ttys1-4 , assuming it's a serial modem). In kppp, click 'Setup', click the 'modem' tab, and click 'Query Modem' to test it. If it says 'Modem not responding', it's the wrong device. If it says 'Modem is busy', there is something wrong. If it gives you a list of responses the modem gave to various commands, you have the right device.
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