Does anyone know why Genesys Cloud returns a 403 Forbidden instead of a standard 401 when re-registering a BYOC trunk after our Singapore carrier rotates the source IP? The outbound routing fails immediately, and the logs show no clear handshake error.
- Region: Singapore (ap-southeast-1)
- Trunk Count: 15 BYOC
- Error: SIP 403 Forbidden on REGISTER
- Timestamp: 1400 SGT today
The carrier claims the IP is whitelisted, but Genesys rejects the registration entirely.