austin - 2011-06-10

I can successfully make calls across opensips, but when I try to create a conference with a third party conference tool (an ACD), I do not get full audio to all participants.  Caller A calls CalledParty B then calls Called Party C and places Called Party B and Called Party C into conference.  B and C can hear each other and can hear Caller A, but A has no audio.  When Caller A breaks down the conference and goes back to Called Party B, both parties can hear audio in both directions. 

Any suggestions on where I need to look?

Thank you