This is the highest-leverage thing on the list and the least impressive to describe. Most enquiries go to whoever responds first — not the cheapest, not the best reviewed, the first. A text that goes out in ten seconds beats a call back in two hours almost every time.
The message is written in your voice, not ours, and it says what you would say: that you are on a job, that you have seen the call, and that you will get back to them. You can change the wording whenever you like.
