I've been experimenting in this area for a while and came to the conclusion Acrobits Groundwire was the best - it has all the features like transfer, call waiting and can even record calls. Really nice bit of software. It works a treat for me on decent wifi signals, I establish an IPSEC VPN back to our office and connect to the IP500 from that. However it falls down a bit on lower bandwidth connections where I'm loosing the voice a bit. There's a really nice call quality indicator on the screen with bars of call quality - if the bandwidth drops this will go down.
It seems to be defaulting to G.729 codec despite me trying to change this around. Does anyone know what codec seems to work best with both ends for lower bandwidth applications?
Thanks in advance