When you can't pick up, the caller gets a text within seconds with who you are, when you'll call back and a link to book. The lead stays yours instead of calling the next number.
Most people who reach voicemail don't leave one. They call the next business on the list. If you're on a roof, under a sink or with a client, that call is gone.
What you need: A business phone number you control and, if you have one, a booking link.
A sentence on how missed-call text-back would help, and what you use today. We'll reply with a straight answer.