VivaSim dialer allow users to make VoIP calls from mobile phones.Download VivaSim SIP Dialer on your device and use without any hassle.
Features
•SIP protocol support
•Call Status Indicator
•Speaker
•Mute
•Save / Edit Username & Password
•Silence Suppression
•Echo Cancellation
•Registration Timeout
Requirements:
Compatible with iPhone Requires iOS 5.0 or later. This app is optimized for iPhone 5.
Internet Connectivity: Wi-Fi,3G