ZOIPER Free Version 2.0 is a new generation SIP and IAX softphone compatible with the Asterisk platform as any other SIP or IAX capable system. ZOIPER Free Edition features include:

* SIP + IAX/IAX 2 protocols
* STUN support
* STUN server per account
* Echo cancellation
* DTMF tones sending
* Support for multiple audio devices
* Automatic user registration
* Call transfer
* Hold function
* Codecs: GSM, ulaw, alaw, speex, ilbc
* Adaptive Jitter Buffer
* Call history
* Address book
* Quick dial panel
* Optional Automatic pop-up window for incoming call
* Always on top
* Call logs
* Voice mail message information
* Account password encryption
* Upgrade notification
* Adjustment of audio device
* Codecs priority
* Portable storage compatibility
* Multilanguage support

ZOIPER can also be re-branded. You can choose one of the three types of re-branding:

* Basic: colours, name and logo to your choice;

* Re-branding with additional development: e.g. changing the language; adding, disabling, removing menus, options, buttons; adding functionalities;

* Complete: you can go for complete change of the interface and functionality.
Details about ZOIPER OEM can be obtained at zoiper@asteriskguru.com.

ZOIPER BIZ, the advanced version of ZOIPER Free, gives more features:

* SIP + IAX protocols
* Native conferencing
* API
* G729 (optionally)
* STUN support
* STUN server per account
* Mail program plug-in: Outlook integration
* Callto URL protocol
* Automatic provisioning (XML)
* Call forward
* Auto answer
* Incoming URL handling
* Automatic opening of incoming URL
* Access voice mail message with one button
* Codec settings per account
* Attended transfer (native)
* Call recording (Single file recordings)
* Command line dialing
* Custom ring tones
* TCP/TLS transport with SIP
* Open URL on call answer
* Call history
* Call transfer
* Unlimited number of accounts
* Changeable number of lines (up to 6)
* More!