SIP 183 Session Progress vs 302 Moved Temporarily
SIP 183 (Session Progress) is a 1xx Provisional response, while 302 (Moved Temporarily) is a 3xx Redirection 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, 302 means that the callee has temporarily moved to a different address. The client should retry the request at the Contact address but continue using the original URI for future requests.
คำอธิบาย
Used to convey information about the progress of the call that is not otherwise classified. Often carries early media (ringback tones, announcements) via SDP.
เมื่อคุณพบเห็น
During call setup, especially in PSTN interworking scenarios. The response may contain SDP for early media like custom ringback tones or IVR prompts.
วิธีแก้ไข
No fix needed — this is informational. If early media is not playing, check codec negotiation and SDP handling in your UA.
คำอธิบาย
The callee has temporarily moved to a different address. The client should retry the request at the Contact address but continue using the original URI for future requests.
เมื่อคุณพบเห็น
When a user is temporarily reachable at a different location, such as when traveling or using a different device.
วิธีแก้ไข
Redirect the current call to the Contact URI provided, but keep the original URI for future requests.
ความแตกต่างหลัก
183 is a 1xx Provisional response, while 302 is a 3xx Redirection 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 302: The callee has temporarily moved to a different address. The client should retry the request at the Contact address but continue using the original URI for future requests.
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 302 when when a user is temporarily reachable at a different location, such as when traveling or using a different device.
ควรใช้อันไหนเมื่อไร
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 302 (Moved Temporarily): Redirect the current call to the Contact URI provided, but keep the original URI for future requests.