Knowledgebase
Getting Started
- Interconnecting with SIP.US - The Basics
- Check SIP Trunk Registration Status
- SIP.US Status Page
- Setting Up Outbound Calling
- Setting up Caller ID and STIR/SHAKEN
- CNAM Explained and How to Set Up
General Information
- Know Your Customer (KYC)
- Call Failover Options
- E911 - Important Information
- How to Set Up IP Authentication
- SIP Glossary of Terms
- How to Forward All Calls for a DID to an External Number
Troubleshooting Guides
- Failed Calls Troubleshooting with SIP.US Technical Support
- SIP Trunk Registration Connection Issues
- Inbound Calls are Failing
- Calls Showing Up As Scam Likely & Potential Spam
- Direct Media Delivery and Missing Audio
- Cannot Place International Calls
Messaging
Billing
Porting
- How to Submit a Port Request
- Common Port Request Rejections
- Porting Glossary of Terms
- Where to Set Port-Out and Account PIN
- Porting Department Holiday Schedule 2025
- How to Port Out Numbers