Depends on the state. Most states are "one party" where only one party (i.e. a person making or receiving a call has to know about it). http://www.dmlp.org/leg

Depends on the state. Most states are "one party" where only one party (i.e. a person making or receiving a call has to know about it). http://www.dmlp.org/legal-guide/recording-phone-calls-and-conversations http://www.dmlp.org/legal-guide/recording-phone-calls-and-co... Federal law is "one party" as well.