iKcon Infotech

iKcon Infotech VOIP is a FREE SIP softphone application for voip calls over 3G or WiFi.

iKcon Infotech's key features include:

- Lowest battery usage with highest reliability / stability on google play

- Lowest latency of all android softphones

- Excellent audio quality, even on older devices

- Supports calling over 3G and WIFI

- Background / multitasking support

Speakerphone mute and hold

- UDP and TCP transports (use TCP for better battery life!)

- Supports g711 (ulaw, alaw), speex, iLBC and gsm codecs.