Emergency Maintenance: HA/HA+ International Inbound Call Recursion

identified · 23 Jun 2026, 15:45

Components: SIP Trunks - IP Auth Window: 2026-06-24T20:00:00+00:00 → 2026-06-24T22:00:00+00:00 ## What’s Changing Updates are being made to the **call routing logic** for inbound calls to **non-UK DDIs**. For customers using **HA or HA+ IP Authenticated SIP Trunks**, the routing process between configured endpoints will now correctly preserve **SIP header formatting** (including Request URI and To headers) during failover/recursion. ## Why This Change Some customers using HA/HA+ services with international numbers have reported that, during failover to a secondary endpoint, the **Request URI and To header can occasionally be incorrectly formatted**. This update resolves that issue by ensuring **consistent SIP header handling across retry attempts**. ## Expected Impact **Affected Services:** HA / HA+ IP Authenticated SIP Trunks **Scope of Impact:** Limited to inbound calls to **non-UK DDI numbers** **Customer Disruption:** Minimal expected impact **Fallback Plan:** If any issues are identified, the changes will be **rolled back**, and routing logic will be re-evaluated in development environments. ## Action Required **No action required from customers.** ## Contact If you have any questions, please contact: **[email protected]**