modem emulator

[Gregory Nowak]

Hi all.

I know the following question is a silly one, but I have a couple devices that would prove more useful then they already are, if a program like the following exists.

Is there a program for GNU/Linux which could emulate a modem?

Yes, I know that pppd can do the majority of what I'm thinking of, but I'm thinking of something that could also produce responses to at strings, and generate all the output that a modem would,
thereby tricking the client device into thinking that it is hooked up to and using a real modem.

Thanks.

Greg