Ask HN: Having phone number going straight to voicemail better than no number?

SAAS product with many customers, but a small team, we cannot handle live phone support yet. Will sending people straight to voicemail be more annoying for them, than not having any number and just send users to calendly for call back appointment? Is having a number on the page, even if connected straight to voicemail a better solution? I was not able to find any good case studies about that or examples how to handle it.