California law does not allow tape recording of telephone calls unless all parties to the conversation consent (California Penal Code 632), or they are notified of the recording by a distinct "beep tone" warning (CPUC General Order 107-B(II)(A)(5)). However, tape recordings can legally be made if an individual or members of one's family are threatened with kidnapping, extortion, bribery or another felony involving violence. The person receiving the threats can make a tape recording without informing the other party. (California Penal Code 633.5)
Federal law allows recording of phone calls and other electronic communications with the consent of at least one party to the call. A majority of the states and territories have adopted laws based on the federal standard. But 12 states, including California, require the consent of all parties to the call. These are are California, Connecticut, Florida, Illinois, Maryland, Massachusetts, Michigan, Montana, Nevada, New Hampshire, Pennsylvania, and Washington.