Ohio's wiretapping law is a "one-party consent" law. Ohio law makes it a crime to intercept or record any "wire, oral, or electronic communication" unless one party to the conversation consents. Ohio Rev. Code § 2933.52. Thus, if you operate in Ohio, you may record a conversation or phone call if you are a party to the conversation or you get permission from one party to the conversation in advance. That said, if you intend to record conversations involving people located in more than one state, you should play it safe and get the consent of all parties.