436 4xx Client error RFC 8224
SIP 436 Bad Identity-Info
The certificate reference in the Identity header could not be retrieved or used.
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Common causes
- The STIR/SHAKEN certificate URL is unreachable or invalid.
How to fix it
- Check the info= URL in the Identity header and certificate hosting.
Seeing 436 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.