SIP 181 Call Is Being Forwarded vs 182 Queued
Both SIP 181 (Call Is Being Forwarded) and 182 (Queued) belong to the 1xx Provisional category. 181 indicates that a proxy server may send this to indicate that the call is being forwarded to a different set of destinations. Meanwhile, 182 means that the called party is temporarily unavailable but the server has decided to queue the call rather than reject it. The call will be attempted when the callee becomes available.
Description
A proxy server may send this to indicate that the call is being forwarded to a different set of destinations.
When You See It
When the callee has call forwarding enabled and the request is being redirected to another number or device.
How to Fix
No action needed. The call is being redirected. If forwarding is unintended, the callee should update their forwarding settings.
Description
The called party is temporarily unavailable but the server has decided to queue the call rather than reject it. The call will be attempted when the callee becomes available.
When You See It
In call center or queuing scenarios where the callee is busy but the system holds the call in a queue.
How to Fix
Wait for the call to be dequeued. If queuing is not desired, configure the server to reject calls instead of queuing them.
Key Differences
SIP 181: A proxy server may send this to indicate that the call is being forwarded to a different set of destinations.
SIP 182: The called party is temporarily unavailable but the server has decided to queue the call rather than reject it. The call will be attempted when the callee becomes available.
You encounter 181 when when the callee has call forwarding enabled and the request is being redirected to another number or device.
You encounter 182 when in call center or queuing scenarios where the callee is busy but the system holds the call in a queue.
When to Use Which
For 181 (Call Is Being Forwarded): No action needed. The call is being redirected. If forwarding is unintended, the callee should update their forwarding settings. For 182 (Queued): Wait for the call to be dequeued. If queuing is not desired, configure the server to reject calls instead of queuing them.