sergey-safarov left a comment (kamailio/kamailio#4290)

Let me rephrase the issue description.
Please start Kamailio with the config file

route{
	forward();
}

And send an OPTIONS message using the command

cat options-extra.txt | nc -u 192.168.1.1 5060

Where a private IP address needs to be replaced with the IP address of Kamailio on the network interface.

In this case, Kamailio will forward the OPTIONS message towards 158.51.225.1.
If you check the forwarded message, you will see the trailer bytes in the UDP frame.

If I understand the RFC requirements, trailer should be discarded.

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.

As I understand it, Kamailio does not meet these requirements.

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