<p>I believe this is related to the initial request coming in with a port 5061 on it, even though I strip that by setting $rp="";</p>

<p>Here is a trace from a UA that does not include the port on the initial request line:</p>

<p><a href="https://gist.githubusercontent.com/etamme/13ec00e78d585083100f/raw/ad5120e10ce86e6930785b4a6dfe2db8c8532bc3/gistfile1.txt">https://gist.githubusercontent.com/etamme/13ec00e78d585083100f/raw/ad5120e10ce86e6930785b4a6dfe2db8c8532bc3/gistfile1.txt</a></p>

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