NEW HAMPSHIRE is considered an All-Party Consent State, in that all people involved in the recorded communication must give permission.
As per the Justia website1,
New Hampshire law provides that it is illegal to record an in-person or telephone conversation without the consent of all parties. However, the New Hampshire Supreme Court has held that a party essentially consented to a recording when the overall circumstances demonstrated that they knew they were being recorded. Illegal recording is a felony unless the person recording was a party to the conversation or had the consent of a party, in which case it is a misdemeanor. Violators may also be subject to civil liability. NH Rev Stat § 570-A:2 (definition & penalty), § 570-A:11 (civil damages), New Hampshire v. Locke, 761 A.2d 376 (N.H. 1999)
As per the Upcounsel website2,
Video surveillance laws differ greatly from state to state. There’s a total lack of federal laws prohibiting video surveillance in public, in the workplace, and elsewhere, sometimes known as CCTV, or closed-circuit television. Most states allow this surveillance to occur, but there are some small exceptions and some circumstances that require monitoring on a case-by-case basis.
Federal and state laws differ as to the legality of recording phone calls and conversations. Determining which jurisdiction’s law controls in cases involving recording devices or parties in multiple states can be complex, so it is likely best to adhere to the strictest applicable law when in doubt, and/or get the clear consent of all parties before recording.
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*Information in the "Policy" section does not constitute as legal advice. Please consult an attorney for any and all legal advice. (1) Recording Phone Calls and Conversations https://www.justia.com/50-state-surveys/recording-phone-calls-and-conversations/ (2) Video Surveillance Laws by State: Everything You Need to Know, https://www.upcounsel.com/video-surveillance-laws-by-state