Need help on how to get phone/device ip address using TAPI2/TAPI3

Hi, 
      I have developed sample client application which will talk to Avaya server and will receive call related information interms of events. I am able to receive agent_id and agent_extension (phone extension) through events. But i am not able to receive phone/device ip address.

Can any one help me out how to get phone ip address using TAPI2/TAPI3..?

And let me know is it possible to capture the device ip address through events..? If so please kindly give me the solution, as it very urgent requirent for me...

Thanks
Venkatesh.