QOS configuration - Is there a way to prevent marking SIP signaling as media

I have configured QOS for Lync 2013 per all the documenation, blogs, etc.
While reviewing network captures to make sure it is working, I noticed something:  normal SIP signaling traffic from the Lync servers to port 5067 uses random source ports, and when those source ports fall into the ranges defined for media, gets marked
as if it was media traffic.  This is over-prioritizing: marking SIP signaling traffic with a higher DSCP than is warranted.
Any way to prevent this?

The two main methods are marking source ports or marking anything coming from the service executables with a DSCP value.  Sometimes SIP signaling traffic will fall into the source range, and it will always come from the service executable.  You
can't force only signaling to use a set range source ports, so there's not too much you can do.  That being said, SIP signaling traffic is generally negligible compared to the media traffic so I generally just let it be. 
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