405
SIP
405 Method Not Allowed
The method specified in the Request-Line is not allowed for the address identified by the Request-URI.
On this page
When You See This Code
When sending a SIP method (e.g., MESSAGE, PUBLISH) that the server does not support for the target URI.
How to Fix
Check the Allow header in the response to see which methods are supported. Use a supported method instead.
Specification
Cross-Protocol Equivalents
Compare With
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
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PBX (Private Branch Exchange)
MFA (Multi-Factor Authentication)
TLS Versions
Frequently Asked Questions
What is SIP 405 Method Not Allowed?
The method specified in the Request-Line is not allowed for the address identified by the Request-URI.
When do you see SIP 405 Method Not Allowed?
When sending a SIP method (e.g., MESSAGE, PUBLISH) that the server does not support for the target URI.
How to fix SIP 405 Method Not Allowed?
Check the Allow header in the response to see which methods are supported. Use a supported method instead.