My BYO SIP Trunk is registered and incoming calls to my Vapi number work perfectly. However, all outbound calls fail immediately with the following error in the logs: call.in-progress.error-providerfault-outbound-sip-403-forbidden Key Evidence: Call ID:6c67c3b2-1dc0-4ac8-9f96-7a0a0762f78d, 32ad8386-3caf-4c77-9616-8e883c82ffa8, 21c5e36e-efaf-4f45-8ea1-7cc8e42d5627 SIP Provider: PBX HOSTING Request: Since inbound calls work, the issue appears to be with outbound authentication/authorization on my provider's side. Please: Check your SIP logs for the Call ID above to see why the INVITE is being rejected. Provide the public IP addresses Vapi uses for outbound SIP traffic so I can whitelist them with my provider. Thank you for your assistance.

To allow outbound SIP traffic from Vapi, please whitelist the following public IP addresses with your provider:

44.229.228.186/32
44.238.177.138/32

Ensure these IPs are allowed for SIP signaling and media. This should help resolve outbound call authorization issues if IP whitelisting is required by your provider. [See Vapi SIP trunk documentation for details.](https://docs.vapi.ai/advanced/sip/sip-trunk#network-requirements) Source: - [Vapi SIP Trunk Documentation](https://docs.vapi.ai/advanced/sip/sip-trunk#network-requirements)

El problema es que nisiquiera llega al servidor

Hi Alexisgb, For a 403 Forbidden error during outbound calls on a BYO SIP trunk, please check these common issues: 1. **SIP Trunk Configuration**: Ensure that your SIP trunk credentials and SIP server address are correctly set up in Vapi. Refer to the [SIP Trunking Guide](https://docs.vapi.ai/advanced/sip/sip-trunk) for detailed steps. 2. **IP Allowlisting**: Check that the necessary Vapi IP addresses (44.229.228.186/32 and 44.238.177.138/32) are allowlisted in your SIP provider’s access control lists. 3. **Authentication Method**: If you are using IP-based authentication, verify that your SIP provider supports this and that a dedicated SIP address is used. 4. **Credentials**: Confirm that your authentication credentials (username and password) are correct and correspond to the configuration in Vapi. See the [SIP integration setup](https://docs.vapi.ai/advanced/sip/sip-trunk) section for creating SIP trunk credentials. If the issue persists after checking these areas, consider reviewing any recent changes in your SIP server settings or contacting your SIP provider for additional insights.