M1 - Mobile Voip is a SIP-based softphone with excellent voice and video call quality. It could be used as an extension phone when it is connected to an IP-PBX, Softswitch or IMS. Notice: - To use M1 - Mobile Voip, you need to get a SIP account from SIP provider first and get Operator Code from our support. Features: - Auto sync local contacts - Call History - Voice call - Voice Codec: G729, PCMU and PCMA - Mute, Speaker, DTMF, Call Wait, Voice exchange. - Echo cancellation, VAD (Voice Activity Detection) - QoS: help improve Voice Call Quality - Supports UDP - RC4 Encryption standards for VOS3000 Softswitch - Available over 3G, 4G and Wi-Fi