Just noticed that outbound calls routed through our primary Singapore BYOC trunk are failing with SIP 403 Forbidden immediately after the nightly certificate rotation script executed at 02:00 SGT. The trunk registration status shows ‘Registered’ in the Edge UI, and the SIP credentials have not been altered, yet the carrier is rejecting the INVITE requests with a 403 response citing ‘Invalid Auth Header’ despite the new X.509 certificate being correctly bound to the outbound proxy configuration. Can anyone confirm if there is a known caching delay or a specific header validation change in the latest Genesys Cloud release that causes registered trunks to reject calls with the new cert until a manual deregister/register cycle is forced?
Check the SIP Authentication Profile in the BYOC Edge configuration. Certificate rotation often invalidates the stored Auth Header cache if the Digest Realm doesn’t match the new cert’s subject. Force a re-auth by toggling the trunk status or updating the Password field in the SIP Trunk config to trigger a fresh registration.
It depends, but generally… The SIP Authentication Profile is often the culprit when certificate chains change without updating the Digest Realm.
Try clearing the Auth Header cache by toggling the trunk status, as the old realm might still be cached despite the new X.509 cert being bound.
This issue stems from the Digest Realm mismatch after the certificate rotation, not the credentials themselves. Do not simply toggle the trunk status without verifying the realm alignment in the SIP Authentication Profile, as this will cause recurring 403 errors.
If I remember correctly… this feels like a category error in the workflow. As a WFM scheduler, I don’t touch SIP trunks or messaging payloads, but I see this pattern constantly when integrations fail after automated cert rotations, so checking the Digest Realm alignment is definitely the right move here.