VOIP Calling issue

I have recently boughth ASUS 14" laptop with windows 7. Since the laptop had only the headphone out port and no mike input port I bought a USB headphone with mike . Have tested the headphone on Skype and Yahoo Messenger and it works just fine i.e I can hear very clearly and and the other end the other user is also able to hear my voice clearly. But when I try making VOIP calls and use this headphone, the call gets thorugh but I am unable to hear any sound and at the other end the other person is also not able to hear me. This is not an isuue of the VOIP service provider since I have tried making this calls with diffrent VOIP service providers and am facing the same issue. Hence it seems that some changes need to be done in the settings. But not sure what. Kindly help

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