A customer rings, describes what they want, mentions three details that change the price, and agrees a date. The call ends. What survives is whatever the person remembered to write down while talking, which is typically the date and one of the three details. Weeks later there is a disagreement about what was included, and neither side is lying - there is simply no record.
Transcription has become good enough and cheap enough to close this gap. A recorded call produces a full text, and a tool can pull out the parts that matter: what was agreed, what was promised, what the deadlines are, what remains open. For site visits and technical conversations this is transformative, because it lets the person concentrate on the customer instead of on writing, and the notes are more complete than anything they would have managed by hand.
The first obligation is legal and not optional. Recording rules differ by country and by context, but announcing the recording and getting agreement at the start of the call is both the simplest approach and close to universally sufficient. It takes one sentence. Where the conversation covers personal or sensitive information, there are further duties about storage and retention, and those apply to a recording exactly as they apply to any other record.
The second is about accuracy. Transcripts misheard names, numbers and technical terms, and a summary built on a misheard figure carries the error forward with complete confidence. Any number that determines money - a price, a measurement, a quantity - should be read back against the recording or confirmed with the customer rather than trusted from the transcript. This is the same rule as everywhere else with these tools: use them for the bulk, verify the parts that carry consequence.
The habit that makes the whole thing worthwhile costs a minute. After the call, send the customer a short written summary of what was agreed and ask them to correct anything wrong. This turns an internal note into a shared record, surfaces misunderstandings while they are still cheap, and is far more valuable than the transcript sitting in a folder - because the point was never to have a recording, it was to have both parties agreeing about the same thing.