13246: Dial: SIP dialing not enabled for this account

You receive this warning when you try to send a call to a SIP endpoint from an account that is not enabled for SIP dialing. SIP dialing is used when you route a call with <Dial><Sip> or when you create a call with a SIP URI in the To parameter of the Calls API.

• Your TwiML uses <Dial><Sip> to connect a call to a SIP endpoint, but the account that executed the TwiML is not enabled for SIP dialing.
• Your Calls API request uses a SIP URI such as sip:user@example.com in the To parameter, but the account that sent the request is not enabled for SIP dialing.
• The account that originates the SIP session does not have SIP dialing enabled. Twilio returns this warning at the account level before it can place the SIP call.

• Enable SIP dialing on the account that originates the call before you use <Dial><Sip> or a SIP URI in To. If you need help with account access or feature enablement, contact Support from the affected account.
• Use the correct SIP dialing entry point for your workflow. Route an active call with <Dial><Sip>, or create a new outbound SIP call by sending a SIP URI in the To parameter of the Calls API.
• After SIP dialing is enabled, allow Twilio SIP signaling IP addresses and media ports in your communications infrastructure so Twilio can send SIP traffic to your endpoint.

• Outbound - Receiving SIP from Twilio
• TwiML Voice: <Sip>
• Making SIP Calls