Avoid voice messages if possible. Modern AI systems can recognize voices very effectively and assign them to people in a similar way to automatic facial recognition. This is comparable to a fingerprint, which is unique and unmistakable.
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Companies such as spitch.ai offer banks and other companies the opportunity to supplement their customer support with AI. This should eliminate the need to ask for passwords, dates of birth or similar verifications during a phone call. In future, automatic voice analysis will be all that is needed to reliably identify customers on the phone. The voice pattern will be stored centrally by AI companies. This becomes problematic when investigating authorities use this stored data to deanonymize people in messengers based on their voice, for example.