405 4xx Client error RFC 3261
SIP 405 Method Not Allowed
The method in the request is known but not allowed for this address. The response lists allowed methods in an Allow header.
Typical Q.850 / ISDN cause: 63 (Service or option not available)
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Common causes
- Sending REFER, MESSAGE, SUBSCRIBE or UPDATE to a device that does not accept them.
How to fix it
- Check the Allow header and adjust the feature, for example use re-INVITE instead of UPDATE, or disable presence subscriptions.
Seeing 405 on calls through a router or firewall? Check that SIP ALG is disabled. It causes a surprising number of SIP errors. Read why.
About 4xx responses
The request has a problem or cannot be completed at this server, usually because of something on the requesting side or the target user.