Siax is a perfect VOIP application for your Iphone. With Siax you can add any or multiple VOIP providers to make cheap calls when you are in a WIFI Hotspot or you have a 3G/UMTS connection. Siax supports SIP and IAX2 protocol.

Key Features
• SIP and IAX2 protocol
• STUN enable/disable
• Multiple SIP and IAX2 accounts
• Codecs: G.711 a/u and GSM
• DTMF support
• Wlan and 3G/UMTS support
• Edge/GPRS support (please read the FAQ)
• Dial from the phone book
• We promise no echo, no delay