Customer context: The customer wants transcripts only for the calls of a specific team or number, and asks whether transcription can be limited to selected phone numbers or call buttons.
Customer question: Can I enable call transcription for only some phone numbers?
Solution: The "Enable call transcription" checkbox in Configuration > Call > Settings is a single account-wide setting - there is no separate transcription switch per phone number or per call button. In practice you still decide the scope through call recording, because transcription only ever runs on a recording: a phone number or call button that does not have call recording enabled produces no recording, so those calls get no transcript and no transcript section at all in the ticket. Enabling call recording only where you want transcripts is therefore the way to narrow the feature down.