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I need to develop an android app by which i can make call to any mobile phones/landlines. Is there any free SIP servers and SIP clients to achieve this ?

Sivakumar
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LinPhone provides open source SIP clients.

They also have a number of server parts, but it's unclear if you mean free as in beer - in general making free phone calls to real physical mobile/landlines is not possible, someone somewhere has to pay the charge!

zmarties
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