Acme SBC3830 not inserting itself into the media stream.

Hello,

I have a basic call configuration, ingress to SBC, SBC to egress, but from the logs it seems like the SBC is not inserting itself into the media stream.  On the egress INVITE to the peer I see the connection IP in the SDP being copied from the ingress SDP, not inserting itself into the media stream and acting as a proxy instead of a B2BUA. 

Where in the configuration can I check whether the SBC is a proxy or a B2BUA? I am running SCX6.2.0 MR-5 Patch 4.

thanks,

Mark