John,
It is noteworthy that all of the video shopping companies, whose assignments also include recorded audio and so are covered by the 2 party consent laws, agree that prior consent is required in CA. Be sure your lawyer is looking at the law for AUDIO recording and NOT for phone taps. They are two entirely different laws.
Also, just call the MSC that told you to record and ask, "Have you verified that the client has obtained prior written consent to audio recording by all of its employees?"
The expectation of privacy loophole is for video recording, BTW, not for audio. The video loophole was affirmed by SCOTUS some time ago. The audio laws vary by state.
And, yes, I know many, many shoppers who have consulted a lawyer on this subject and, asked the right (audio) question, their lawyers agree, as do the lawyers advising all of the radio and TV companies whose employees record audio as part of their jobs. (They record the consent of the interviewed party on the spot, but do not broadcast that part of the interview.) Passersby may be inadvertantly recorded, but the subject of the interaction ALWAYS has the protection of the prior consent law in two party states.
Both MSPA and IMSC conference speakers who are specialists in this subject agree with what I have said here.
Based in MD, near DC
Shopping from the Carolinas to New York
Have video cam; will travel
Poor customer service? Don't get mad; get video.