Is there a way to automatically forward calls to a different number? I have a phone number attached to an outbound calling assistant, but when people call that number back I want it to auto forward to a call center that takes inbound calls

By configuring the assistant with a transferCall tool that redirects calls to your call center number, optionally with a message, or set up a server URL for dynamic routing based on conditions.

I'm wanting the call to instantly forward - meaning there is no conversation that takes place, no assistant answering, etc. For example, the customer calls "+1 123" and the call is automatically rerouted to "+1 456" 100% of the time. Is that possible with the current transferring methods?

Yes, you can use the transferCall tool to instantly forward calls to another number without any assistant interaction by setting the firstMessage to an empty string for silent transfers.