Setting different username and extension number

hi
currently I’m gonna use my old cisco 2821 as fxo and fxs gateway in my house, the problem is that cisco needs at least 4 character to use as username, but I need my extensions to be 3 digits, so in cisco when username is 4 digit and destination-pattern is 3 digit I get this error
chan_sip.c: username mismatch, have <202>, digest has <1202>
what can I do?

Not only can you have different extension numbers and usernames, this is actually advised in the best security practice document, included in the Asterisk source tree!

chan_sip is deprecated, unsupported, and scheduled for removal in the Autumn 2023 version of Asterisk.

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well actually Im using issabel and it takes longer for assabel to have this feature, but what can i do right now? ive already enabled match_auth_username in sip setting but no luck!

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