By Adaptive Digital Technologies
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The ipVoice application is a SIP Phone application as well as VoIP test application. It demonstrates Adaptive Digital's VoIP Engine and VoIP SDK for iOS. The ipVoice application is available as an XCode reference project that can be used to develop VoIP enabled iOS apps.
Acoustic Echo Cancellation
Automatic Gain Control
What's New in Version 4.0
Support for SIP
Peer to Peer operation