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On some modems you could tweak a register so that if you had call waiting it wouldn't drop carrier.
Ahh, yes, the tweaking-of-the-register. Are you sure you want to open that can of worms here?

lol...no, just saying it's been done. A long time ago I used to install software at restaurants that dialed into a database to submit food orders. I had to deal with this issue a number of times:

From Lose the carrier signal

If a modem can not hear it's carrier signal for a certain period of time then the modems will disconnect from each other. This sometimes can happen because of Call Waiting as the call waiting beep stops the carrier. If the phone lines are having problems then that will also cause this problem. One thing you can do that will sometimes help stop this from happening is to type in the following setting into the Extra Settings box in the modem properties window.

The way to stop this from happening is to type in the following setting into the Extra Settings box in the modem properties window.

S10=50

This setting will keep the modem connected for 5 seconds after it loses the carrier signal. The modem may be able to pick up the carrier signal again in that time. If the modems still keep disconnecting then you could try increasing the time. For example, if you wanted the modems to stay connected for 10 seconds then the setting would be -

S10=100.

The highest setting you can have is S10=254.