CWA 2007 R2 Desktop Sharing through Isa 2006 Not working for External users

I have setyup CWA within our OCS environment and have an issue with Desktop sharing.

Setup
1 x OCS Server
1 x Edge Server with 1 nic for interal and 1 nic for external (consolidated setup using seprate ports for each function)
1 x CWA Server with internal and external Virtual web servers
1 x ISA 2006 used for Web Proxy

DNS is setup with as and download CNAmes for both internal and external services and all certificates are setup with the correct SANs.
ISA Server is setup with FQDN and as.FQDN, download.FQDN in the external path

Internal Users can run Desktop sharing without any issues, regardless of client.
External CWA client users cannot initiate a share and get the error message "Cannot start desktop sharing session currently." But internal MOC can share desktops with external CWA client without any issues.

Can anyone help?
PellfrischmannAsked:
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BusbarSolutions ArchitectCommented:
If your CWA server is cwa.company.local then you also need CNAME records for as.cwa.company.local and download.cwa.company.local which point to cwa.company.local.


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PellfrischmannAuthor Commented:
As mentioned already I have these setup both internally and externally.
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BusbarSolutions ArchitectCommented:
do you have them in your certificate.
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PellfrischmannAuthor Commented:
yes
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BusbarSolutions ArchitectCommented:
can external user run desktop sharing using MOC, have you tried that?
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PellfrischmannAuthor Commented:
not configured or tested the edge server to do anything other than IM at present
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BusbarSolutions ArchitectCommented:
this is the problem since connection is done using the AV edge server on the edge
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PellfrischmannAuthor Commented:
Please explain??  All the blogs and deployments guides I have read indicate that the edge server is not needed.
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BusbarSolutions ArchitectCommented:
http://blogs.technet.com/greganth/archive/2009/05/06/communicator-web-access-2007-r2-and-desktop-sharing.aspx
If you are planning to have external CWA users that will initiate desktop sharing you must configure a CWA external virtual server and OCS Access Edge Server to include the A/V Edge Server role.  Reason is that an internal virtual server will not provide Edge SDP candidates required for the connection across the A/V Edge for the external CWA client to connect and send it’s RDP stream encapsulated in SRTP to the AS MCU on the Front End server.

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PellfrischmannAuthor Commented:
Expert has explained why the services is not working,
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