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### Description
We would use **www_challenge** method of **auth** module on our kemi lua script.
Function is not mapped on [auth
kemi](https://kamailio.org/docs/tutorials/5.3.x/kamailio-kemi-framework/mod…
so we tried to use
[
modf](https://kamailio.org/docs/tutorials/5.3.x/kamailio-kemi-framework/kem…
but we have every time this log
```
app_lua [app_lua_api.c:1725]: sr_kemi_lua_modf(): function 'www_challenge' has
fixup - cannot be used
```
We tried this call to the method on lua script
```
KSR.x.modf("www_challenge", realm, 1);
```
The question is:
are we calling method on a bad way or is not possible to call www_challenge method by kemi
lua ?
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### Troubleshooting
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