Chating application which incorporates voice (voip)

Hi All,

we have a requirement of developing the chat application which should
have both text based chating as well as voice based, we know
developing a text based chat app is straight,but having voice chat
incorporated ??,hmm .. could any body give me some suggestions, links,
code or throw some insight on this topic, which can help me in
satifying the requirements

Thanks in Advance
Deepak

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