Right so calling my attorney is the same since I'm sharing the call with the phone company.

Nope. The wiretapping laws precedent is known as ‘minimization’; when a legal tap is obtained of your phone lines, the expectation is that every effort will be taken not to tap attorney-client calls, lest your entire evidence packet get thrown out for failure to do so. That precedent is not automatically transitive to AI just because one thinks it ought to be; telephone lines between human beings are protected both by extensive case law and also actual law; neither yet applies between one human and a third-party corporation offering an AI, especially when at least one major AI is contractually declared in shrinkwrap to be ‘for entertainment use only’.

maybe not the call itself but the voicemail for example. can it be "extracted"?

another point to make it safer would be sharing the "chat" with the lawyer, this way it becomes media of communication