Syn Phone Syn Phone is a product of Syn System family. Syn Phone is a softphone that allows calls, video calls and instant messaging with support to presence, conferencing, voice mail and contact management. Syn Phone is based on the SIP protocol and it's compatible with the most popular PBXs and VoIP providers. Syn Phone has different features according to the edition.  
Latest version: X2 2.11.
Available editions: Lite - Standard.
Supported languages: English.