SIP 183 Session Progress vs 414 Request-URI Too Long
SIP 183 (Session Progress) is a 1xx Provisional response, while 414 (Request-URI Too Long) is a 4xx Client Failure response. 183 indicates that used to convey information about the progress of the call that is not otherwise classified. Often carries early media (ringback tones, announcements) via SDP. In contrast, 414 means that the server is refusing to service the request because the Request-URI is longer than the server is willing to interpret.
Descrição
Used to convey information about the progress of the call that is not otherwise classified. Often carries early media (ringback tones, announcements) via SDP.
Quando você o vê
During call setup, especially in PSTN interworking scenarios. The response may contain SDP for early media like custom ringback tones or IVR prompts.
Como corrigir
No fix needed — this is informational. If early media is not playing, check codec negotiation and SDP handling in your UA.
Descrição
The server is refusing to service the request because the Request-URI is longer than the server is willing to interpret.
Quando você o vê
When the SIP URI in the request line is excessively long, which may happen with URI parameters or long phone numbers.
Como corrigir
Shorten the Request-URI. Remove unnecessary parameters or use a shorter alias for the destination.
Diferenças principais
183 is a 1xx Provisional response, while 414 is a 4xx Client Failure response.
SIP 183: Used to convey information about the progress of the call that is not otherwise classified. Often carries early media (ringback tones, announcements) via SDP.
SIP 414: The server is refusing to service the request because the Request-URI is longer than the server is willing to interpret.
You encounter 183 when during call setup, especially in PSTN interworking scenarios. The response may contain SDP for early media like custom ringback tones or IVR prompts.
You encounter 414 when when the SIP URI in the request line is excessively long, which may happen with URI parameters or long phone numbers.
Quando usar qual
For 183 (Session Progress): No fix needed — this is informational. If early media is not playing, check codec negotiation and SDP handling in your UA. For 414 (Request-URI Too Long): Shorten the Request-URI. Remove unnecessary parameters or use a shorter alias for the destination.