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Overview

The “Dial Failed” error occurs when an outbound call cannot be connected. This is most commonly a SIP trunking configuration issue.

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Common Causes

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Twilio

  • IP Access Control Lists not configured — You must add both ACL entries (0.0.0.0/1 and 128.0.0.0/1)
  • Origination URI missing — Inbound calls require the origination URI to be set
  • Termination URI incorrect — Double-check the URI in your Assistable import settings
  • Account not verified — Twilio requires account verification before making calls

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Telnyx

  • FQDN not configured — Must be set to 5t4n6j0wnrl.sip.livekit.cloud
  • Wrong inbound format — Must be +E.164 format
  • Missing outbound voice profile — Create and select one

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General

  • Number format — Must be raw E.164 format (+1XXXXXXXXXX)
  • International restrictions — Platform numbers only support US/Canadian (+1) destinations
  • Wallet balance — Check both agency and sub-account wallets
  • Number not assigned — Verify the assistant has a phone number linked
Assistable stores the SIP info you provide. Whether calls connect depends on your telephony provider’s configuration. For persistent issues, contact your provider’s support.