486
SIP
486 Busy Here
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.
当您看到此代码时
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.
如何修复
Wait and try again later. The callee may become available when their current call ends. Consider leaving a voicemail if available.
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对比
与之对比
指南
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Security & Authentication
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Real-Time Protocols
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Real-Time Protocols
WebRTC Signaling with SIP and WebSocket
Real-Time Protocols
RFC 3261: SIP Protocol Deep Dive
Protocol Deep Dives
TLS 1.3: Faster, Simpler, More Secure
Protocol Deep Dives
规范
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VoIP (Voice over IP)
Presence (SIP)
PBX (Private Branch Exchange)
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TLS Versions