SIP 180 Ringing vs 600 Busy Everywhere
SIP 180 (Ringing) is a 1xx Provisional response, while 600 (Busy Everywhere) is a 6xx Global Failure response. 180 indicates that the UA receiving the INVITE is trying to alert the user. This response is used to initiate local ringback tone at the caller's end. In contrast, 600 means that the callee's end system was contacted successfully but the callee is busy and does not wish to take the call at this time. Unlike 486 (Busy Here), this is a definitive response.
คำอธิบาย
The UA receiving the INVITE is trying to alert the user. This response is used to initiate local ringback tone at the caller's end.
เมื่อคุณพบเห็น
During call setup when the callee's phone is ringing. You should hear a ringback tone after receiving this response.
วิธีแก้ไข
No fix needed — the callee's device is ringing. If the call never connects after ringing, check the callee's device or call forwarding settings.
คำอธิบาย
The callee's end system was contacted successfully but the callee is busy and does not wish to take the call at this time. Unlike 486 (Busy Here), this is a definitive response.
เมื่อคุณพบเห็น
When the callee has rejected the call on all devices. No other endpoints should be tried. The user is universally busy.
วิธีแก้ไข
Wait and try again later. No alternative contact points exist. The callee must become available on their own.
ความแตกต่างหลัก
180 is a 1xx Provisional response, while 600 is a 6xx Global Failure response.
SIP 180: The UA receiving the INVITE is trying to alert the user. This response is used to initiate local ringback tone at the caller's end.
SIP 600: The callee's end system was contacted successfully but the callee is busy and does not wish to take the call at this time. Unlike 486 (Busy Here), this is a definitive response.
You encounter 180 when during call setup when the callee's phone is ringing. You should hear a ringback tone after receiving this response.
You encounter 600 when when the callee has rejected the call on all devices. No other endpoints should be tried. The user is universally busy.
ควรใช้อันไหนเมื่อไร
For 180 (Ringing): No fix needed — the callee's device is ringing. If the call never connects after ringing, check the callee's device or call forwarding settings. For 600 (Busy Everywhere): Wait and try again later. No alternative contact points exist. The callee must become available on their own.