With its simple and intuitive user interface, Crystal is the solution to making high quality calls for a fraction of the cost. Utilizing the latest the latest advances in VOIP technology, you can be ensured that all your communications are secure and affordable.
• Crystal is a SIP-based soft phone. You can call your friends and family from Crystal with lowest international call rates! And very good quality.
Features
• SIP-based softphone with exceptional voice quality
• Works from Wifi/3G/GSM
• Support for DTMF
• Easy contact book, call history.
In addition to your cost savings, we offers:
• Secure and reliable communication
• Compatible with VOIP switches supporting standard SIP
• Unique anti-block solution
• Option to brand own dialer
• Advance Echo Cancellation
• Flexible integration with your phone book contacts
• Screen display for your call history, call timer and balance
1.voice quality improved
2.stability improved
9Apps 4.9
