[SR-Users] t_relay_cancel usage

[Juha Heinanen]

in tm readme there is this kind of example regarding use of
t_relay_cancel:

if (method == CANCEL) {
	if (!t_relay_cancel()) {  # implicit drop if relaying was successful,
                                  # nothing to do

		# corresponding INVITE transaction found but error occurred
		sl_reply("500", "Internal Server Error");
		drop;
	}
	# bad luck, corresponding INVITE transaction is missing,
	# do the same as for INVITEs
}

if proxy is processing all invites statefully, why anything needs to be
done when invite transaction corresponding the to cancel is missing?
isn't it a case of unmatched cancel and the cancel could just be
dropped?

-- juha