sergey-safarov created an issue (kamailio/kamailio#4290)
### Description
According to [RFC3261](https://www.ietf.org/rfc/rfc3261.html#section-18.3)
Section 18.3
```
In the case of message-oriented transports (such as UDP), if the
message has a Content-Length header field, the message body is
assumed to contain that many bytes. If there are additional bytes in
the transport packet beyond the end of the body, they MUST be
discarded.
```
In the current Kamailio implementation, extra bytes are analyzed, and this
triggers a failed sanity check.
### Troubleshooting
#### Reproduction
To reproduce required prepare config file
```
listen=udp:127.0.0.1:5060
loadmodule "xlog.so"
loadmodule "sl.so"
loadmodule "sanity.so"
modparam("sanity", "autodrop", 0)
modparam("sanity", "noreply", 1)
route{
if(sanity_check()) {
sl_send_reply("200", "OK");
exit;
}
xerr("sanity checks failed\n");
sanity_reply();
drop;
}
```
And start using a command like
```
kamailio -DD -E -f kamailio.cfg
```
Then need to send options using a command like
```
cat options-extra.txt | nc -u 127.0.0.1 5060
```
Where `options-extra.txt` is a file from the attached archive
[options.tar.gz](https://github.com/user-attachments/files/20838024/options.tar.gz)
If you remove extra bytes after the OPTIONS message, then Kamailio does not
generate an error.
This can be tested using the command
```
cat options-normal.txt | nc -u 127.0.0.1 5060
```
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