<p>I have never used it myself. I just wanted to help this one mailing list post, but of course, this commit is broken.</p>
<p>I just looked into the path module how it's done there, and there exists a struct for different transports:</p>
<pre lang="const"><code>        [PROTO_TCP] = "%3Btransport%3Dtcp",
        [PROTO_TLS] = "%3Btransport%3Dtls",
        [PROTO_SCTP] = "%3Btransport%3Dsctp",
        [PROTO_WS] = "%3Btransport%3Dws",
        [PROTO_WSS] = "%3Btransport%3Dws",
};```

This gets appended to the received param if needed. Then a Path header looks like this:

```Path: <sip:1.2.3.4;lr;received=sip:4.3.2.1:49194%3Btransport%3Dtcp>.```

Unfortunately I'm not able to implement that for the nathelper module as my C knowledge is limited to doing such trivial stuff like the commit above.
</code></pre>

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