Can we use land line phone to control houshold electrical equipments. Is the techonology available?

Can we use land line phone to control houshold electrical equipments. Is the techonology available. I am asking in sense how we use IVR when we call a bank, can we have someting in similar lines. For example, switing on a microwave at home before i leave office.

The answer is a qualified "yes." You can connect your lights and appliances to X10-based switches and dimmers, and use the X10 Telephone Responder to control them remotely by phone. This will not allow you to turn on a microwave, because microwaves require their buttons to be pushed. But you could control lights, appliances and HVAC remotely with the right X10 receivers connected. See the links below for some phone-based controllers.