iSipSimple is a SIP client for iPhone and iPod touch. With it, you can make cheap VoIP calls via WiFi using any VoIP provider. You can also setup the SIP server in your own organization.
Here are some key features of "iSipSimple":
· support SIP calls
· support G711 and GSM codec, iLibc and G722 codec for iPhone 3GS
· support to use alternative RTP port
· support stun server
· support global outbound proxy
· support proxy server for individual account
· shortcut to regular cellular network
· full VPN support for enterprise customers
· SIP account setup wizard for more than 60 SIP providers
Requirements:
· iOS 3.0 or later
· Compatible with iPhone, iPod touch, and iPad
What's New in This Release: [ read full changelog ]
· fix iOS5 issue