SIP 200 OK vs 380 Alternative Service
SIP 200 (OK) is a 2xx Success response, while 380 (Alternative Service) is a 3xx Redirection response. 200 indicates that the request has succeeded. For INVITE, the call has been answered. For other methods, the action has been completed successfully. In contrast, 380 means that the call was not successful but alternative services are possible. The response body contains a description of alternative services.
Description
The request has succeeded. For INVITE, the call has been answered. For other methods, the action has been completed successfully.
When You See It
When a call is answered (INVITE 200 OK), a registration succeeds (REGISTER 200 OK), or a subscription is accepted (SUBSCRIBE 200 OK).
How to Fix
No fix needed — this is a success response. The caller should send an ACK to complete the three-way handshake for INVITE transactions.
Description
The call was not successful but alternative services are possible. The response body contains a description of alternative services.
When You See It
Rarely seen in practice. Indicates that the request cannot be fulfilled as-is but the user may be reached via an alternative method.
How to Fix
Check the response body for alternative service descriptions and attempt to reach the user through those channels.
Key Differences
200 is a 2xx Success response, while 380 is a 3xx Redirection response.
SIP 200: The request has succeeded. For INVITE, the call has been answered. For other methods, the action has been completed successfully.
SIP 380: The call was not successful but alternative services are possible. The response body contains a description of alternative services.
You encounter 200 when when a call is answered (INVITE 200 OK), a registration succeeds (REGISTER 200 OK), or a subscription is accepted (SUBSCRIBE 200 OK).
You encounter 380 when rarely seen in practice. Indicates that the request cannot be fulfilled as-is but the user may be reached via an alternative method.
When to Use Which
For 200 (OK): No fix needed — this is a success response. The caller should send an ACK to complete the three-way handshake for INVITE transactions. For 380 (Alternative Service): Check the response body for alternative service descriptions and attempt to reach the user through those channels.