Recording Software for VOIP Calls,

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Dear Friends,

I am looking for software which could record a VOIP call, such as calls made from Voipbllast, Voipgain and other Betamax Internet paid VOIP (Voice Over internet Protocol) phones.
I have already used some of them but they record only one way conversation. I am sure there would be something available somewhere but if any of you Gents have good and trusted one, please let me know.
On Skype, I am using one and it is the best one but it is not usable outside Skype!