Video Call between Pocket PCs

Hi all!

I am developing an application that amongst other features, includes launching a video conference between pocket PCs on a private LAN. On my google investigations I came across asterisk, but I am not sure if this is really what I require. Will using it will be overkill?

Basically I need to know wich of the following topologies do I need:

  1. only two PDAs with a softphone on each (which softphone?)
  2. PDAs with softphone making a call through asterisk
  3. PDAs with a softphone making a call through asterisk and involving other system that I may be missing…

Any help would be greatly appreciated! I really don’t know where I should start…

Best regards,