Port forward UDP range to shared network

Hi all,

I'm running Parallels 7 and I need to forward a whole range of traffic to make a piece of VOIP software work. I can forward an individual port no problem under Preferences, Advanced, Shared, Port Forwarding rules, but other than making an entry for each port I can't find a way to specify an entire range. That would be 128 individual entries.

Any help would be appreciated.

P.S. - this is under shared networking and this is a corporate network that does not allowed bridged networking.

 

Anyone know of a way to do this? Is this in a preference file that can be edited maybe? Thanks for any suggestions.