I havea sip proxy/server, it's possible to connecte vapi on my VOIP server ? i dont understand how it's work thanks for your help

Yes, you can connect Vapi to your own SIP proxy/server using the "Custom BYO SIP Trunk" option. Here’s a quick example of how to create a SIP trunk credential in Vapi (replace the placeholders with your actual SIP server details):

bash
curl -X POST "https://api.vapi.ai/credential" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_VAPI_PRIVATE_KEY" \
  -d '{
    "provider": "byo-sip-trunk",
    "name": "My SIP Trunk",
    "gateways": [{ "ip": "YOUR_SIP_SERVER_ADDRESS", "inboundEnabled": false }],
    "outboundAuthenticationPlan": {
      "authUsername": "YOUR_SIP_USERNAME",
      "authPassword": "YOUR_SIP_PASSWORD"
    }
  }'

Gather your SIP server address and credentials, then use this API call to connect Vapi to your VOIP server. For more details, see the [Vapi SIP Trunking guide](https://docs.vapi.ai/advanced/sip/sip-trunk). Source: - [SIP Trunking | Vapi Documentation](https://docs.vapi.ai/advanced/sip/sip-trunk)

ok thank, but if i used this it's possible to use for inbound callto vapi ?

Message marked as helpful by @barto_95 | 🇵🇹! 🎉

what is the ip of vapi when connect to SIP Server ?

To connect Vapi to your SIP server, you need to allowlist the following IP addresses for SIP signaling and media:

44.229.228.186/32
44.238.177.138/32

Add these to your SIP server's firewall or access control list to ensure proper connectivity. These IPs are used exclusively for Vapi SIP traffic. For more details, see the [Vapi SIP Trunking documentation](https://docs.vapi.ai/advanced/sip/sip-trunk). Source: - [SIP Trunking | Vapi Documentation](https://docs.vapi.ai/advanced/sip/sip-trunk)

i have error failed to create sip trunk credential and i check no request from vapi to my sip server @Vapi Support Bot

Suggestion: Double-check that you have allowlisted both Vapi IPs (

44.229.228.186/32

and

44.238.177.138/32

) on your SIP server's firewall or ACL. If not, Vapi cannot reach your server and credential creation will fail. Here’s the required step:

plaintext
# Add these to your SIP server's allowlist:
44.229.228.186/32
44.238.177.138/32

After updating your firewall, try creating the SIP trunk credential again. For more details, see the [Vapi SIP Trunking documentation](https://docs.vapi.ai/advanced/sip/sip-trunk). Source: - [SIP Trunking | Vapi Documentation](https://docs.vapi.ai/advanced/sip/sip-trunk)

when i configured the information to connect no request from vapi to my sip server received for registration

Hi, could you please provide the credential id of the SIP trunk? Phone number works too.