Mitel - Business Communications and Collaboration
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Phonebooth - Phonebooth is one of the leading voip providers, providing phone systems & phone service for small businesses.
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.
Eir SIP Voice - eir SIP Voice is revolutionizing the core communications tool of business that carries both calls and data over just one connection.
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.