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Error Codes
How should error codes be structured?
IANA registry
Both machine and human-readable
with language tags
Need to be able to add codes later without upgrading clients
redirection
client error (like HTTP/SIP 4xx) ? don’t retry as-is
server error (5xx) ? retry later
Options:
symbol + severity + human-readable text
numeric (3xx, 4xx, 5xx) + text
PPT Version