Sonetel won’t allow automated outbound SIP traffic, so the 403 error is their policy, not a config issue. The smoothest path is moving to providers like Twilio, Vonage, or Telnyx, which are fully compatible with Vapi. I’ve helped set up these integrations before and can guide you through migration without losing your webhook/backend work. Are you planning high-volume outbound campaigns or smaller controlled flows? @rog13980hx