In addition to the link adam posted, if you could draw down how the call flow looks like we might be able to say more.
On the vcs you talk about traversal and non-traversal/local calls.
That would reflect your flow-through (traversal) / flow-around (non-traversal).
Try to use the traversal/non-traversal that makes it easier for us and also you to understand when you read
documentations or look at the status of the vcs :-)
If the endpoint is behind NAT/Firewall/Traversal zone it is the expected behavior that you see the media
coming from the customers VCS-E.
And your posting is a bit confusing anyhow, as you write VCS-E and VCS, do you refer to a VCS-C?
If you have a setup where you offer for example a traversal zone for a customers VCS-C then this call
will be a traversal call which binds the media from the endpoint, to the VCS-C to the VCS-E.
If you need further help please make a drawing of the exact call flow and involved components.
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