412
SIP
412 Conditional Request Failed
The precondition given in the request was not met. Used with SIP event state publication (RFC 3903).
On this page
When You See This Code
When a PUBLISH request includes an If-Match header with an entity tag that does not match the current state on the server.
How to Fix
Refresh the entity tag by performing a new PUBLISH without If-Match, then use the returned SIP-ETag for subsequent updates.
Specification
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
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TLS 1.3: Faster, Simpler, More Secure
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Frequently Asked Questions
What is SIP 412 Conditional Request Failed?
The precondition given in the request was not met. Used with SIP event state publication (RFC 3903).
When do you see SIP 412 Conditional Request Failed?
When a PUBLISH request includes an If-Match header with an entity tag that does not match the current state on the server.
How to fix SIP 412 Conditional Request Failed?
Refresh the entity tag by performing a new PUBLISH without If-Match, then use the returned SIP-ETag for subsequent updates.