With easyVoipRecorder tool you could record VoIP softphone calls.

At now this app supports:

# Google Talk
# Globe7
# VoipCheap
# VoipStunt
# VoipBuster
# 12Voip
# VoipWise
# VoipRaider
# VoipDiscount
# JustVoip
# Yahoo Messenger
# LowRateVoip
# Net2Phone CommCenter

Check this at
http://www.easyvoiprecorder.com