Lync 2013 and OCS 2007 sip.xxx.com certificates

I am currently at the end of a OCS 2007 to Lync 2013 co-existence stage. Internally the Lync 2013 meetings and services are working except for external meetings.

I am wondering if my external certs might also be the cause of the issue. I have cert A named sip.xxx.com pointing to OCS Edge and cert B (with same name) pointing to Lync Edge. Currently everything is still going through the OCS Edge except for a small amount of test users. Our external DNS A record is still pointing to OCS Edge.

I cant figure out how external users would know how to traverse OCS Edge to Lync Edge in order to use the meeting services...
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Group_007Asked:
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Jakob DigranesSenior ConsultantCommented:
they can't ....
you need to allow users to come in via Lync edge, then Lync Front End will redirect them to OCS Edge.
For external meetings, they join via reverse proxy meet.domain.com - but audio/video/application sharing will traverse through Edge in meetings

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