# Sinch: Service Announcement & Maintenance: New SMSC Site & Whitelisting Requirements - US Region

- Provider: [Sinch](https://outages.live/sinch.md)
- Type: Maintenance
- State: scheduled
- Worst impact: Maintenance
- Started: 2026-12-01 07:00 UTC
- Components: SMPP - US, ENUM US, HTTP - US, HTTP US, Messaging APIs - SMPP - US, Messaging APIs - HTTP - US, Lookup API Endpoints - ENUM US, Lookup API Endpoints - HTTP US
- Official update: https://stspg.io/pybt2k9s49z9

## Updates from Sinch

### scheduled, 2026-11-01 20:03 UTC

We are writing to inform you that the concerned maintenance activity has been postponed to the below mentioned timeframe. Type: Service Announcement & Maintenance Previous Start Time: 2026-10-15 07:00 UTC Previous End Time: 2026-10-15 08:00 UTC New Start Time: 2026-12-01 07:00 UTC New End Time: 2026-12-01 08:00 UTC As part of our commitment to platform reliability, security, and scalability, Sinch is adding a brand-new, high-efficiency site to our core SMSC billing and messaging routing engine product. This site expansion introduces a next-generation, high-performance architecture to significantly increase our regional capacity, improve overall platform stability, and ensure robust message processing. New Regional Connection Endpoints that are planned to go live 2026-10-15 during the aforementioned time window. US SMPP: us6.smpp.api.sinch.com: US HTTP SMS: us6.httpsms.api.sinch.com US Lookup API: us6.httplookup.api.sinch.com Action Required: Firewall Whitelisting To ensure uninterrupte