Deploy Assistant on Client's Phone Number

Once I have finished building an assistant and connected it with a Twilio phone number on VAPI, how do I connect the assistant with one of my client's business phone number so that when someone calls that biz number, the assistant answers the call ?

The client wants the assistant to be deployed on an existing phone number.

I'd like to know if you have any resources for this or what are the ways of achieving this, thanks.
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