| SIP + IAX / IAX 2 protocols |
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| STUN support |
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| STUN server per account |
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| TCP support with SIP |
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| TLS support with SIP |
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| TLS with SRTP support |
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| Available codecs - GSM, ulaw, alaw, speex, ilbc |
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| G.729 (optional, with Zoiper Biz only) |
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| T.38 Fax-receiving and Fax-sending capabilities |
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| DSCP support |
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| Echo cancellation |
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| Changeable number of lines (up to 6) |
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| Multilanguage support |
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| Native conferencing |
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| API |
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| Account import (XML) |
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| Selectable Strip dial characters option |
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| Automatic provisioning (XML) |
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| Callto URL protocol |
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| Incoming URL handling |
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| Automatic opening of incoming URL |
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| Open URL on different call events |
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| Auto answer |
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| Mail program plug-in: Outlook integration |
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| Mail program plug-in: Thunderbird integration |
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| Portable Zoiper with portable devices (USB sticks, flashcards, etc.) |
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| Blind call transfer |
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| Attended transfer |
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| Call forward |
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| Account password encryption |
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| Codec settings per account |
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| Automatic user registration |
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| Optional Automatic pop-up window for incoming call |
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| Hold function |
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| Support for multiple audio devices |
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| Adaptive Jitter Buffer |
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| Voice mail message information |
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| Access voice mail message with one button |
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| Command line dialing |
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| Number of accounts |
2 accounts for Zoiper Free; Unlimited for Zoiper Biz |
| Outband DTMF tones sending |
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| Call recording (Single file recordings) |
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| Custom ring tones |
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| Call logs |
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| Call history |
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| Address book |
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| Quick dial panel |
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| Always on top |
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| Minimize on start up |
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| Minimize to tray |
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