There are 12 States in the U.S. That requires ALL parties involved in the conversation (All Party Consent) to be made aware that the conversation is being recorded. These States are:
California
Connecticut
Delaware
Florida
Illinois
Maryland
Massachusetts
Michigan
Montana
New Hampshire
Pennsylvania
Washington
The following 38 States require that at least ONE person (One Party Consent) involved in the conversation has given permission for the conversation to be recorded including the person doing the recording:
Alaska
Arkansas
Colorado
Georgia
Hawaii
Idaho
Indiana
Iowa
Kansas
Kentucky
Louisiana
Maine
Minnesota
Mississippi
Missouri
Nebraska
Nevada
New Jersey
New Mexico
New York
North Dakota
Ohio
Oklahoma
Oregon
Rhode Island
South Dakota
Tennessee
Texas
Utah
Vermont
Virginia
West Virginia
Wisconsin
Wyoming
This falls under the United States Code: Title 18.2511. As long as you actually take part in the conversation and are doing so in a State that allows "One Party Consent", it is quite legal to record the conversation without another party in the conversation giving permission or even being told that they are being recorded.
The answer with the States provided is exactly correct and the actual US code was provided to prove its validity. No one needs to be "Notified" in "One Party Consent" States which Missouri is indeed one of. It is true that you cannot ever record another person or persons conversation without one of the parties consent or all parties consent in the 12 named States if you're not part of the conversation, but as long as you yourself are a part of that conversation, you are permitted under that US code to record the conversation as you are that "One Party" and it is a little silly to notify yourself, don't you think? To use as an example, if I were to receive a call from a debt collector and I answered the phone while in the State of Missouri, I can start recording the conversation as soon as I answer the phone without telling the caller that I am doing so. It is what is considered "Black letter law" and can't be disputed in a Court of Law.
Not without at least one party to the call or conversation being notified that recording is occurring. It is illegal in ALL states to intercept and record conversations to which you are not a party.
In Pennsylvania, it is legal to record a conversation with your boss as long as you are part of the conversation and do not record it secretly.
In Texas, it is legal to record a conversation as long as at least one party involved in the conversation consents to the recording.
In Texas, it is legal to record a conversation as long as at least one party involved in the conversation consents to the recording.
In Pennsylvania, it is legal to record a conversation as long as at least one party involved in the conversation consents to the recording.
In Texas, it is legal to record a conversation as long as at least one party involved in the conversation consents to the recording.
In Washington state, it is legal to record a conversation if at least one party involved in the conversation consents to the recording.
In Massachusetts, it is legal to record a conversation as long as at least one party involved in the conversation is aware of and consents to the recording.
In California, it is legal to record a conversation if all parties involved consent to being recorded.
In Texas, it is legal to record a phone conversation as long as at least one party involved in the conversation consents to the recording.
In California, it is legal to record a phone conversation if all parties involved consent to the recording.
In Pennsylvania, it is legal to record a conversation if at least one party involved in the conversation consents to the recording. This is known as a "one-party consent" state.
In Pennsylvania, it is legal to record a conversation if at least one party involved in the conversation consents to the recording. This means that you can record a conversation as long as you are part of the conversation and give your consent to the recording.