SIP 180 Ringing vs 486 Busy Here
SIP 180 (Ringing) is a 1xx Provisional response, while 486 (Busy Here) is a 4xx Client 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, 486 means that the callee's end system was contacted successfully but the callee is currently not willing or able to take additional calls at this end system.
Deskripsi
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.
Ketika Anda Melihatnya
During call setup when the callee's phone is ringing. You should hear a ringback tone after receiving this response.
Cara Memperbaiki
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.
Deskripsi
The callee's end system was contacted successfully but the callee is currently not willing or able to take additional calls at this end system.
Ketika Anda Melihatnya
When the callee is already on a call and does not have call waiting. The user explicitly rejected the call, or all lines are in use.
Cara Memperbaiki
Wait and try again later. The callee may become available when their current call ends. Consider leaving a voicemail if available.
Perbedaan Utama
180 is a 1xx Provisional response, while 486 is a 4xx Client 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 486: The callee's end system was contacted successfully but the callee is currently not willing or able to take additional calls at this end system.
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 486 when when the callee is already on a call and does not have call waiting. The user explicitly rejected the call, or all lines are in use.
Kapan Menggunakan Yang Mana
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 486 (Busy Here): Wait and try again later. The callee may become available when their current call ends. Consider leaving a voicemail if available.