Trying to understand why our SIP trunk registration is consistently failing with a 407 Proxy Authentication Required error when migrating phone systems from Zendesk Talk to Genesys Cloud. We are working on a project for a client in the Europe/Paris timezone, and the migration involves moving approximately 200 agents. In Zendesk, phone setup was relatively straightforward with direct PSTN connections handled by Zendesk’s underlying infrastructure, so we didn’t have to worry about SIP trunk configuration or proxy settings. However, Genesys Cloud requires explicit BYOC (Bring Your Own Carrier) trunk configuration, and we are hitting a wall with the authentication. The Genesys Cloud version is 2024-11-20, and we are using the standard SIP trunk configuration wizard. The error occurs immediately after saving the trunk credentials and attempting to validate the connection. The logs show a 407 response from our carrier’s proxy server, indicating that the authentication credentials provided in the trunk configuration are not being passed correctly or are being rejected by the proxy. We have verified that the username and password are correct and match what was used in our previous Zendesk setup, although Zendesk handled this internally. We have also checked the firewall settings to ensure that outbound traffic on port 5060 and the RTP port range is allowed. The issue seems to be specific to how Genesys Cloud formats the SIP REGISTER request or how it handles proxy authentication challenges. We have tried regenerating the credentials in our carrier’s portal, but the error persists. We are looking for insights on how to properly configure the SIP trunk in Genesys Cloud to handle proxy authentication, especially when migrating from a platform like Zendesk that abstracted these details away. Any advice on troubleshooting SIP trunk registration issues or understanding the differences in authentication handling between Zendesk and Genesys Cloud would be greatly appreciated. We are eager to get this migration completed successfully and want to ensure that our agents can make and receive calls without interruption.
This error typically indicates a mismatch in the proxy authentication credentials or an incorrect proxy address configuration within the SIP trunk settings. Verify that the username, password, and proxy host match the provider’s requirements exactly. Ensure no special characters in the password are causing serialization issues.
| Parameter | Requirement |
|---|---|
| Proxy Host | Must match provider DNS |
| Auth Method | Digest (usually) |
| Credentials | Exact match with provider |
Check your SIP trunk configuration for proper proxy authentication headers.
{
"proxyAuth": {
"username": "your_username",
"password": "your_password",
"realm": "your_realm"
}
}
Ensure these match your provider’s specifications exactly.
To fix this easily, this is to verify the authentication realm matches the SIP provider’s exact requirement. While the previous suggestions cover the basics, I have seen this specific 407 error persist when the realm parameter is missing or incorrect in the trunk configuration.
In Genesys Cloud, ensure the proxyAuth object includes the correct realm value alongside the username and password. This often gets overlooked during migrations from Zendesk Talk, where the underlying infrastructure handled these details differently.
{
"proxyAuth": {
"username": "your_username",
"password": "your_password",
"realm": "your_provider_realm"
}
}
Double-check that no trailing spaces exist in these fields. Also, confirm that the proxy host address is correctly formatted. This usually resolves the registration failure quickly. If the issue persists, check if any special characters in the password need escaping. Good luck with the migration!
Make sure you validate the SIP trunk configuration via the Genesys Cloud API directly to ensure the proxyAuth object is serialized correctly, as the UI sometimes masks encoding issues with special characters in the password field. The 407 Proxy Authentication Required error often persists when the realm parameter is omitted or mismatched, as noted in the previous suggestions, but it can also stem from improper URL encoding of the credentials during the initial registration handshake. I recommend using the PUT /api/v2/architect/siptrunks/{sipTrunkId} endpoint to explicitly define the authentication details. Below is a sample cURL command that demonstrates how to update the trunk with the correct proxy authentication settings, ensuring the realm matches your SIP provider’s exact requirement:
curl -X PUT "https://api.mypurecloud.com/api/v2/architect/siptrunks/{sipTrunkId}" \
-H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
-H "Content-Type: application/json" \
-d '{
"proxyAuth": {
"username": "your_username",
"password": "your_encoded_password",
"realm": "your_sip_provider_realm"
},
"proxyHost": "your.proxy.host.com",
"proxyPort": 5060
}'
This approach bypasses potential UI serialization bugs. Additionally, verify that the proxyHost and proxyPort align with your provider’s documentation. If the issue persists, check the Genesys Cloud diagnostic logs for any TLS handshake failures that might be masquerading as authentication errors. Since I primarily work with mobile SDKs and Web Messaging, I often see similar authentication mismatches when integrating push notification services, so double-checking these network-level credentials is crucial. Ensure your timezone settings in the Genesys Cloud admin panel are correctly set to Europe/Paris to avoid any time-based certificate validation issues during the migration process. This detailed configuration step should resolve the 407 error and allow your 200 agents to register successfully.