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ProtocolCodes
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.

On this page

When You See This Code

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.

How to Fix

Wait and try again later. The callee may become available when their current call ends. Consider leaving a voicemail if available.

Specification

View RFC / Specification →

Comparisons

SIP 480 Temporarily Unavailable vs 486 Busy Here SIP 486 Busy Here vs 600 Busy Everywhere

Compare With

100 Trying 180 Ringing 181 Call Is Being Forwarded 182 Queued 183 Session Progress 199 Early Dialog Terminated 200 OK 202 Accepted 204 No Notification 300 Multiple Choices 301 Moved Permanently 302 Moved Temporarily

Guides

401 Unauthorized vs 403 Forbidden: When to Use Each Security & Authentication
SIP Response Codes: Understanding VoIP Call Flow Real-Time Protocols
SIP Call Flow: Understanding Session Setup 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

Specifications

RFC 3261 SIP: Session Initiation Protocol

Glossary

Status Code Request Method (HTTP Verb) TLS Handshake Authentication TCP/IP Port Number NAT (Network Address Translation) Socket Request-Response Model RFC (Request for Comments) Connection-Oriented Full-Duplex SRV Record SIP Dialog Signaling SIP Registrar STUN (Session Traversal Utilities for NAT) TURN (Traversal Using Relays around NAT) SDP (Session Description Protocol) SIP INVITE SIP Proxy Server SIP Redirect Server SIP Transaction SIP User Agent SIP Trunk RTP (Real-time Transport Protocol) SRTP (Secure Real-time Transport Protocol) SIP ACK SIP BYE SIP CANCEL SIP OPTIONS SIP SUBSCRIBE/NOTIFY B2BUA (Back-to-Back User Agent) SBC (Session Border Controller) Codec Negotiation SIP Response Classes VoIP (Voice over IP) Presence (SIP) PBX (Private Branch Exchange) MFA (Multi-Factor Authentication) TLS Versions

Frequently Asked Questions

What is 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.

When do you see SIP 486 Busy Here?

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.

How to fix SIP 486 Busy Here?

Wait and try again later. The callee may become available when their current call ends. Consider leaving a voicemail if available.