I have this same issue with the same device. Jono (reporter) posted a 
workaround on his blog here:
http://www.jonobacon.org/2008/06/17/polycom-communicator-low-mic-volume/

I can confirm that this fix works.

However, it is extremely unintuitive. Both the Gnome sound control panel
and alsamixer command-line tool do not help with this problem -- you can
set it to 100% in alsamixer and over-amplify in Gnome sound control
panel, which does affect the volume, but it is still deathly quiet. I
would not mark this bug as Invalid, as there is a user interface issue
here if nothing else.

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https://bugs.launchpad.net/bugs/240623

Title:
  Polycom Communicator mic volume too low

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