12月20日的OpusTel应用程序分析

OpusTel OpusTel is the mobile phone App for iPhone, iPod and iPad, permitting one to use a real Swiss international telephone number, e.g. 0041 41 520 60 00. It allows one to make and to receive secure VoIP calls from any iOS device using 5G/4G/3G/UMTS or Wi-Fi Internet connectivity. It was developed with the focus on privacy. Features: 1. Secure incoming and outgoing calls 2. Incomming calls are free of charge (no roamingcosts) 2. HD high-definition audio quality with the G722 and Opus codec 3. Free global calls from OpusTel to OpusTel 4. Easy transfer calls to any telephone number 5. Ability to record incoming and outgoing calls 6. Conference calls 7. Automatic language selection based on handy language (15 languages like EN, DE, CN, FR, ES, IT ...)