Could someone explain the specific validation logic behind the POST /api/v2/trunks/voice/registrations endpoint when dealing with carrier-specific SIP digest algorithms? We are currently managing a complex environment of 15 BYOC trunks distributed across APAC regions, including Singapore, Tokyo, and Sydney, and we have encountered a persistent issue with a new carrier integration in the Jakarta edge. The carrier documentation specifies the use of MD5 for SIP digest authentication, yet when we attempt to update the trunk credentials via the Platform API, the system returns a 400 Bad Request with the error message "message": "Invalid SIP credentials provided for trunk ID: trunk_jkt_04". The request body includes the correct username, password, and realm fields as extracted from the carrier’s provisioning sheet. Interestingly, manual SIP OPTIONS ping tests from the Genesys Cloud edge to the carrier’s registrar succeed without issue, indicating that the credentials are fundamentally correct and the network path is viable. The problem appears isolated to the API’s credential validation layer. We have verified that the API token possesses the Trunk Administrator role with full read/write permissions on the specific trunk resource. Furthermore, checking the GET /api/v2/trunks/voice/registrations endpoint shows the previous credentials are still active, suggesting the update transaction failed at the initial validation stage rather than during the registration handshake. The carrier has confirmed that their SIP servers are not rate-limiting or blocking the specific source IP of the Genesys Cloud edge. Given the verbose nature of the error, it seems the API might be expecting a different hash algorithm or a specific format for the realm parameter that is not documented in the standard BYOC integration guide. Is there a known quirk with how the Platform API handles MD5 vs SHA-256 digest algorithms for non-standard carriers, or should we be looking at a specific configuration flag in the trunk object to override the default authentication method?
You need to ensure the SIP credentials match the exact format expected by Genesys Cloud, which often differs from standard carrier setups. Check out this guide on BYOC trunk configuration: https://support.genesys.com/articles/byoc-sip-config. It explains the specific field requirements clearly.
The documentation actually says SIP digest algorithms must align with Genesys Cloud’s strict validation rules.
MD5 is rarely supported for new integrations. Switching to SHA-256 usually resolves the 400 error immediately.
Verify the credential payload structure matches the API spec precisely before retrying the registration request.