features of app
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+ Lowest battery usage with highest reliability / stability on App Store.
+ Lowest latency of all IOS softphones.
+ Bandwidth normalization.
+ Voice/Video packet negotiation
+ Bluetooth support.
+ Excellent audio quality, even on older devices.
+ Supports calling over WIFI/EDGE/3G/LTE.
+ Background / multitasking support.
+ Integration with the native ios contact list.
+ Speakerphone mute and hold.