Troubleshooting Call Issues

This article provides solutions for common PortSIP PBX issues when making calls. When you make a call from the app or an IP Phone, if the call fails, you will receive a status code indicating the reason. Below, we explain the status codes and their meanings:

480 - Temporarily Unavailable

This status code usually means the callee is not online or unavailable to answer your call.

408 - Request Timeout

This status code indicates the callee can’t be reached, possibly due to a lost network connection.

503 - Service Unavailable

This code may appear for the following reasons:

• The PortSIP PBX can’t provide service at this moment.

• The app/IP Phone failed to resolve the PBX domain DNS.

• The SIP trunk can’t provide service at this moment if the call is sent to the trunk.

• The PortSIP PBX failed to resolve the trunk domain DNS.

403 - Forbidden

This code may appear for the following reasons:

• The current usage exceeds the PortSIP PBX license.

• If you make a call to the SIP trunk and the called number starts with a +, it means this is an international call. In this case, if the extension caller role is a standard user, they will receive this error since standard users do not have permission to make international calls, please change the extension's role to avoid this issue.

• If the extension caller has permission to make international calls, but the country code is disallowed, you will need to allow the country code in the menu: Blacklist and Codes > Codec and E164. Click the tab ALLOWED COUNTRY CODE and select the country code to enable it.

• The current established calls have reached the maximum call limit of the trunk.

• The callee number is in the PBX number blacklist. You can manage the blacklist in the menu: Blacklist and Codes > Number Blacklist.

402 - Payment Required

This code appears if the tenant admin has enabled online billing, but the extension caller does not have enough balance.

404 - Not Found

This code may appear for the following reasons:

• The called extension number does not exist.

• The called PSTN number does not exist.

• The outbound call doesn’t match any outbound rule.

• The outbound call matched a trunk that was not available.

• The outbound rule matched, but it is currently outside office hours or during holidays, click the Office Hours tab of the outbound rule to check.

Feel free to contact the PortSIP support team at [e-mail] or submit a ticket. Our team will help you resolve any issues.