Zoiper

Zoiper is a comprehensive, free softphone application that empowers users to make VoIP calls through 3G or WiFi connections. Designed to deliver an impeccable audio experience with a user-friendly interface, this platform ensures seamless Voice over IP communications for anyone, including service providers, call centers, and businesses looking to harness the advantages of VoIP technology.

The main purpose of this application is to facilitate high-quality voice communication for users subscribed to any SIP or IAX-based service provider. It stands out for its indispensable features such as Bluetooth support (currently in beta), exceptional audio quality even on older devices, intelligent latency reduction techniques, and multiprotocol support for both SIP and IAX. It accommodates the needs of modern users by enabling calls over both 3G and WiFi.

Additionally, the app presents background support for multitasking, native integration with your phone's dialer and contact list, and options like speakerphone, mute, and hold functionalities. Network-wise, it supports UDP and TCP transports—with TCP offering extended battery life. It accommodates various codecs including g711 (ulaw, alaw), speex, iLBC, and gsm, and even enables sending of DTMF tones. DNS SRV and STUN support are also provided, along with built-in echo cancellation, boosting the platform’s capability in diverse network environments.

Please note that this program operates as a standalone client-side software phone and does not come bundled with a specific VoIP service. An active subscription with a suitable provider is essential to fully utilize its capabilities.

Furthermore, there's a free automatic provisioning system to facilitate easy distribution and setup, eliminating complex manual configurations. For users interested in a more personalized touch, custom branding solutions are available upon request. While generally compatible with many devices, certain models like the Samsung Galaxy Pocket S5300 and Motorola Razr may not be supported. Feedback is actively welcomed to enhance support for additional devices in upcoming versions.

Zoiper offers an innovative solution for VoIP calling needs, providing the flexibility and quality required for dependable and clear communication.