| Category | Social & Messaging |
| Requirements | All Platforms |
| License | Free |
| Offered By | N/A |
HD audio and rich codec support: Opus, SILK, G.729, G.711, Speex, iLBC, GSM
Echo cancellation
Microphone gain and speaker volume adjustments
Secure communication with TLS and Secure RTP (SRTP) or ZRTP encryption protocols
Push notifications for incoming calls to improve your battery life
Support for NAT traversal using ICE with STUN or TURN protocols
Support for multiple SIP accounts
Presence using the SIMPLE standard with generic SUBSCRIBE/NOTIFY and PUBLISH messages
Very intuitive UI
Contact list integrated with primary account contact list
Detailed call list and history
Integrated billing information including balance, call rates, charges and payments
Easy balance top-up using Google Play
Account wizard to create or restore SIP account at any VoIP provider
Can be used with any SIP provider
