Outbound SIP Trunk Calls Rejected: Troubleshooting and Solutions
When outbound calls from your Private Branch Exchange (PBX), Session Border Controller (SBC), or gateway through Bigfoot Voice are rejected or fail before connecting, it can disrupt your business communication. This article aims to help you understand the causes, troubleshoot the issue, and provide solutions for restoring outbound calling.
What is Outbound SIP Trunk Calls Rejection?
Outbound SIP trunk calls rejection occurs when calls made from your PBX, SBC, or gateway through Bigfoot Voice fail to connect. This issue may be destination-specific or universal, affecting local, toll-free, international, or emergency calls.
Why is it Important?
Outbound SIP trunk calls rejection can significantly impact your business operations, causing missed opportunities, lost revenue, and customer dissatisfaction. It is crucial to diagnose and resolve this issue promptly.
How Does it Work?
To troubleshoot this issue, collect failed call examples with the outbound caller ID, dialed number, timestamp, and exact error or SIP response. Verify the PBX/SBC source IP, trunk name, SIP domain, transport, port, and authentication method. Check whether the outbound caller ID is authorized and formatted correctly. Review recent changes in the PBX/SBC route, firewall, NAT, codec, dial-plan, or credentials.
What Should the Customer Know or Prepare?
- Calling number: The number making the call (outbound caller ID).
- Called number: The number being dialed.
- Timestamp: The time when the call failed.
- SIP response/reason: The error message or SIP response code received.
- Source IP: The IP address of the PBX, SBC, or gateway making the call.
- Trunk auth method: The authentication method used for the SIP trunk.
- Customer PBX/SBC vendor: The manufacturer or provider of your PBX or SBC.
- Affected destination types: The types of calls that are failing (e.g., local, toll-free, international, or emergency).
- Caller ID used: The number displayed as the caller ID on the recipient's device.
- Recent changes: Any changes made to the PBX/SBC route, firewall, NAT, codec, dial-plan, or credentials.
Common Questions or Issues
Common questions or issues include understanding SIP response codes, diagnosing NAT-related issues, and ensuring outbound caller ID compliance.
How Does Bigfoot Voice Handle This?
At Bigfoot Voice, we work to quickly identify the cause of outbound SIP trunk calls rejection and provide solutions to restore your outbound calling. We may escalate the issue with detailed SIP evidence, call examples, source IP, trunk identifiers, and whether failures are destination-specific or universal.
We are committed to keeping you informed throughout the troubleshooting process and providing you with the tools and resources needed to maintain seamless communication.
If you are experiencing outbound SIP trunk calls rejection, we encourage you to contact our support team for assistance.