@AiTitus :)
It sounds like there might be a discrepancy between the number format you've added in VAPI and the format Twilio is using to send the number. In international number formats, the leading '0' in the area code is often omitted when dialing from outside the country, but it seems Twilio is including it in the number.
To resolve this issue, you can try updating the number format in VAPI to match the format Twilio is using. Make sure to include the '0' after the country code (+61) as Twilio does. If you're unsure how to update the number format in VAPI, please provide me with more details or ask support for more info on this.