Hello Team, so i have a scenario that i'm dealing with. Do i need to register a company's existing phone numbers with Twilio , so that the transfer call function can work ? Does the AI on Vapi need its own phone number , so that it can transfer calls ?

Yes, to use call transfers in Vapi, your needs a Twilio linked phone number, and if you’re using existing company numbers, they must be registered with Twilio, uses its number to handle and transfer calls via the transferCall function..

So how do i verify their office numbers on Twilio so that they are registered for receiving calls ?

Port it to Twilio, then import it Vapi via the dashboard using your Twilio credentials, then assign each number to your Vapi assistant under the Inbound settings to enable call handling.

Okay thank you so much for your help . Do you know how long the process of porting takes?

I don't know

No problem , thank you so much for your help . Really appreciate it

What you're looking for is SIP trunking https://docs.vapi.ai/advanced/sip/sip-trunk But you can have the agent transfer to any phone number, doesn't have to be imported anywhere