key features of “ZoIPer”:

· SIP + IAX / IAX 2 protocols
· STUN support
· STUN server per account
· Available codecs - GSM, ulaw, alaw, speex, ilbc
· T.38 Fax-receiving capabilities
· DSCP support
· Echo cancellation
· Multilanguage support
· Account import (XML)
· Portable Zoiper with portable devices (USB sticks, flashcards, etc.) - for Free and optionally for Biz OEM
· Blind call transfer
· Account password encryption
· Codec settings per account
· Automatic user registration
· Optional Automatic pop-up window for incoming call
· Hold function
· Support for multiple audio devices
· Adaptive Jitter Buffer
· Voice mail message information
· Number of accounts: 2
· Outband DTMF tones sending
· Call logs
· Call history
· Address book
· Quick dial panel
· Always on top
· Minimize on start up
· Minimize to tray

Popularity: 81% [?]