Publishing Lync with Forefront UAG: Access via iPhone App?

Hi there,

I am attempting to make Lync 2010 available to iPhone (and Blackberry) users via the app available on their respective app stores.

Lync is working just fine internally, but doesn't appear to be available externally.  I have set up an A record for lync.domain.com pointing to our Forefront UAG server (in the same fashion as publishing OWA or the like), with an "Application" in UAG set up to forward to the internal IP address of the Lync server.

I am not sure if it is permissible to be set up this way... I can't find any supporting documentation to suggest if UAG is supported.

Consequently, it doesn't appear to work.  Attempting to connect via the iPhone app fails.  Can anyone point me in the right direction as to how to get this working?  I do have TMG available on this server as well, and we do have ISA 2006 available though I'd prefer not to use it as I imagine we'll be phasing it out in the near future as we move over to Forefront.

Thanks!