Acrobits Softphone is the leading SIP client for the iPhone, iPad and iPod Touch. It has a comprehensive SIP account configuration with many advanced options.
This is great for power users, but the average user will appreciate a quick and easy setup where they can enter their basic account details and start making calls immediately.
Acrobits Softphone on the iTunes App Store it is a supported SIP client for the iPhone, iPad and iPod Touch.
Acrobits Softphone contains Global VoIP as a pre-configured provider. After choosing Global VoIP from the list, the user only has to enter their username and password; the other SIP configuration parameters are hard-coded.