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How to start developing VOIP IPhone applicatio,n what are the supported libraries API's available?

BenMorel
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The iphone has multiple VOIP applications available already in the AppStore. So to develop one has a very good chance of approval. Truphone, fring, iCAll are all examples. Also here is an opensource SIP stack http://www.pjsip.org/pjsip/docs/html/index.htm

JT.
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Please see the tips for VOIP apps. I hope this may help you.

http://developer.apple.com/library/ios/#DOCUMENTATION/iPhone/Conceptual/iPhoneOSProgrammingGuide/AdvancedAppTricks/AdvancedAppTricks.html

Ramakrishna Guttha
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Are you sure that Apple is going to allow you to make an application that competes with their carrier's main revenue source? You may want to validate your concept before pursuing it too far.

Scott Whitlock
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    Skype is available on the iPhone. It only works over WiFi and not over 3G or Edge. In other words, you may have a chance of getting Apple's approval if you limit your app. – mahboudz Aug 21 '09 at 07:45
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I Guess Apple is not approving VOIP apps, refer to Google Voice. Google Voice has been rejected in the app store. There is so much noise about this. You can refer this in techcrunch.

Satish
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  • Google Voice app was not even VOIP. It sent Google Voice a message to call a number and then the servers call your phone, then you get connected. You still use minutes. – Tacoman667 Aug 20 '09 at 19:10
  • is US you pay for reciving phone calls ? – Radu Dec 12 '11 at 13:05