body: In the United States, [some states require consent to record](https://law.stackexchange.com/q/6502/31) if one party decides to record the phone call. A person I'm talking to told me they would record the call, do I need to tell them that I will record the call if I decide to?
  
  
  I am especially thinking about customer services who warn the customer that the call may be recorded: can I record the call as well without asking for consent in that case?
  
  
  
  
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  I am mostly interested in the following locations, ordered by descending interest:
  
  
  * California, United States
  * Massachusetts, United States (-> no need for consent in that state, so problem solved)
  * All other states in the United States
  * Paris, France
  * Seoul, South Korea
  
  
  
title: If one person on a phone said they would record the call, do I need to tell them that I record the call if I decide to do so?