adverse-sapphire•2mo ago

Supported required for setting up SIP trunk

Hello VAPI.AI Support Team, I need your assistance with setting up a SIP connection to your platform. My provider DTMS has already configured everything on their side and activated the routing. The SIP trunk has been set up to the following address: sip.vapi.ai However, when attempting to connect, DTMS receive a message indicating that authentication is required. Using static IP addresses from your docs fails also. DTMS is unable to perform authentication, as they only handle trunk configuration. They informed me that there might be an additional setting required on your end, or that a specific customer name (or identifier) needs to be defined in the DNS so that the connection is accepted. The affected phone number is +49 800 5099641. Everything on my side appears to be configured correctly. Could you please check why the connection is currently being rejected, or advise how authentication should be handled in this case? Once the connection is successfully established, we plan to activate our account and provide payment information (credit card), as we intend to use your AI assistant for our business. Thank you very much for your help and support.

5 Replies

Vapi Support Bot•2mo ago

To resolve the authentication issue, you need to create a SIP trunk credential in Vapi for your DTMS connection. Use the following API call (replace placeholders with your actual details):

curl -X POST "https://api.vapi.ai/credential" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_VAPI_API_KEY" \
  -d '{
    "provider": "byo-sip-trunk",
    "name": "DTMS Trunk",
    "gateways": [{ "ip": "sip.vapi.ai", "inboundEnabled": false }],
    "outboundLeadingPlusEnabled": true
  }'

curl -X POST "https://api.vapi.ai/credential" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_VAPI_API_KEY" \
  -d '{
    "provider": "byo-sip-trunk",
    "name": "DTMS Trunk",
    "gateways": [{ "ip": "sip.vapi.ai", "inboundEnabled": false }],
    "outboundLeadingPlusEnabled": true
  }'

After creating the credential, associate your phone number with it in Vapi. This should resolve the authentication error—see the SIP trunk setup guide for details. Source: - SIP Trunking How to integrate your SIP provider with Vapi

⤵️ Mention @Vapi Support Bot for follow-ups 🐥

adverse-sapphireOP•2mo ago

DTMS doesnt accept auth based connections. Just ip based. If there’s an option to set up a dedicated IP address to make this possible or any other working solution, I’d really appreciate it if you could let me know the steps to do so. Otherwise i need to pass an VAPI 🙁

dependent-tan•2mo ago

@fabianbitter_15952 I remember seeing somewhere to just set empy/dummy authentication values and test it. Im not sure about that but maybe worth a try

adverse-sapphireOP•2mo ago

DTMS is not able to enter any auth data. So is there any solution out there? Maybe buying a custom dedicated ip? Is it possible with your service? Hey, I just checked your code example again and noticed that it creates a gateway pointing to itself and only handles outbound calls. What I actually need is inbound routing. DTMS should forward all inbound calls to VAPI. I'm not focusing on outbound calls right now. Could you please suggest a solution for this? Otherwise, we might have to consider switching providers. Got a new support ticker from DTMS {phoneNumber}@<credential_id>.sip.vapi.ai}} Ther are needing the “credential_id” for forwarding. How can i get it?

Vapi•2mo ago

Send a DM to @kylevapi with your org id and I will get it for you. Alternatively, if you use the /credential endpoint to create an entry for your BYO SIP trunk, it will return the credentialId in the response

Supported required for setting up SIP trunk

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