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The operators of the phone system are consenting to the call being recorded by informing you that the call is being recorded. You are consenting to the call being recorded by continuing with the call.

How is that not two party consent?

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It's not a consent, because the options are "Yes" and "Yes", you cannot opt out unless you quit the call.
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No, I mixed it up and GP is right.

If you and I are in a conversation, I can record it or you can record it: that's one-party consent, because one of the parties of the call consents to it. At first glance that may sound tautological, but a third party (e.g. phone company) could not record it without one of us consenting

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Laws are different in different jurisdictions, but often the law only requires notification, not consent.
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