About Zoiper softphone
A multi-platform IAX and SIP softphone, compatible with the Asterisk platform and any SIP-capable system in general. It is available in Free and Biz editions.

Zoper Free offers the following advanced features:
- STUN support
- Various codec support )GSM, ulaw, alaw, speex, ilbc)
- Multiple accounts
- Adaptive Jitter buffer
- Echo cancellation
- Multilanguage support
- Outband DTMF tones sending
- More!
Zoper Biz offers the following premium features:
- TCP/TLS support with SIP
- Automatic provisioning (XML)
- Thunderbird Integration
- Native conferencing
- Many more features

What’s New in this Version
- Zoiper Free
- Zoiper now supports Mac OS X 10.5 (Leopard);
- Added administrator authentication in installer;
- Implemented “Diagnostics” advanced option- it allows to create debug log;
- Fixed a bug- when incoming call is rejected ringing is not stopped;
- Fixed a bug- when “Register on startup” is checked for an account, it is registered on startup but cannot be unregistered;
- Many more enhancements.