Thanks for reporting a potential issue of our project! Just for clarification, 
Kamailio does not contain code from any other project in this case, I tracked 
the related code to be dated back to 2002 (when the project had its original 
name `SER` and the project you named didn't exist). The other project probably 
inherited from this one when it was forked.

Anyhow, I tried to reproduce with the sample SIP message from the web and I 
didn't get any crash with Kamailio git master branch, it prints error messages:

```
 3(142428) ERROR: {1 9 REGISTER 83ZZolAa} <core> 
[core/parser/digest/digest.c:323]: find_credentials(): error while parsing 
credentials
 3(142428) ERROR: {1 9 REGISTER 83ZZolAa} auth [api.c:73]: pre_auth(): Error 
while looking for credentials
 3(142428) DEBUG: {1 9 REGISTER 83ZZolAa} auth_db [authorize.c:261]: 
digest_authenticate_hdr(): error or bad credentials
```

Then sends back SIP 401 response and continues to work normally. Kamailio was 
started with MySQL backed and user authentication done with `auth_db` module 
(like default `kamailio.cfg` with defined `WITH_MYSQL` and `WITH-AUTH`).

Can you provide (here or better via email to mico...@gmail.com) a SIP message 
related to this issue that causes a crash for Kamailio git master branch?

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