I talked to an Illinois State Police trooper the other day and he said that Illinois is definitely a two party consent state. He also stated that anyone thinking of using a phone call recorder should at least consult an attorney and even put one on retainer, if possible. He said that it is a felony, in Illinois at least, and there is no leniency for eavesdropping at all.
I plan to talk to my attorney and find out the best way to go about recording client calls to both protect me and my clients.
This is just informational as it was stated here that I should ask the police. I'm just relaying what the trooper said.
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Modify your phone at your own risk! Always backup!