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  Zoiper Free IAX and SIP softphone 2.15
  ZOIPER 2.0 Free SIP and IAX is a user-friendly softphone, compatible with Asterisk or any other SIP or IAX capable system. High-quality VoIP experience with features like: SIP + IAX protocols, T.38 fax support, STUN support, Echo cancellation, DTMF tones, Adaptive jitter buffer, Call transfer, Hold function, Multilanguage support, Portable storage compatibility, Codecs: GSM, ulaw, alaw, speex, ilbc.
  Attractel | http://www.zoiper.com/downloads/free/win/zoiperfree.exe | 2.80MB | Jul 9, 2008