PLEASE ASSIST ME ON THIS. CAUSE MY SIP PROVIDER GOT NO ISSUE. I TRY RUN A TEST WITH 5 NUMBER, IT CAN BE PROCEED, BUT WHEN MULTIPLE NUMBERS ALL GOT ERROR SIP OUTBOUND 480 https://cdn.discordapp.com/attachments/1455466456967024691/1455466457193513025/Capture.JPG?ex=6986ed44&is=69859bc4&hm=8abdccdf8b39892185f050ef5774f0c3ce2029d4b1201ecf003c050358b06b39&

Actionable Suggestion: To avoid SIP 480 errors when calling many numbers, use Vapi's batch calling with scheduling to pace your calls. For example, schedule calls in smaller groups:

json
{
  "assistantId": "your-assistant-id",
  "phoneNumberId": "your-phone-number-id",
  "customers": [
    {"number": "+11231231234"},
    {"number": "+12342342345"}
  ],
  "schedulePlan": {
    "earliestAt": "2025-12-30T09:00:00Z"
  }
}

This helps prevent provider-side rate limits and should reduce 480 errors. For more, see the [Call ended reasons documentation](https://docs.vapi.ai/calls/call-ended-reason). Sources: - [Call ended reasons documentation](https://docs.vapi.ai/calls/call-ended-reason) - [Outbound Calls documentation](https://docs.vapi.ai/phone-calling/outbound-calls)

HI anyone there

Can you send the call_id? Also, this issue is coming from the telephony end.

019b6e44-6ed1-7bbb-898d-fd9dccf1a6d7 An error occurred in this call: call.in-progress.error-providerfault-outbound-sip-480-temporarily-unavailable

You will need to check wth the telephony provider who can help you out with it.