No auth_challenge use Proxy-Authorization for INVITE messages but we need to use
WWW-Authorization.
A possible solution would be use
[
modf](https://kamailio.org/docs/tutorials/5.3.x/kamailio-kemi-framework/kem…
I do not understand why this peace of code
```
KSR.x.modf("www_challenge", realm, 1);
```
gives error
```
app_lua [app_lua_api.c:1725]: sr_kemi_lua_modf(): function 'www_challenge' has
fixup - cannot be used
```
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