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?
It's not a consent, because the options are "Yes" and "Yes", you cannot opt out unless you quit the call.
It's not a consent, because the options are "Yes" and "Yes", you cannot opt out unless you quit the call.