<p>Thank you Luis<br>
I will try  this PR.<br>
Could you also look <a href="https://tools.ietf.org/html/rfc3665" rel="nofollow">rfc3665</a><br>
Here is many calls examples with proxy. I cannot find here <code>ACK</code> and <code>BYE</code> messages with <code>Record-Route</code> header.</p>

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