MizuPhone is a free SIP softphone for windows which lets you make VoIP/SIP calls to users anywhere in the world using any VoIP service provider, SIP server or your own PBX.

Features:
-Easy to use, zero-touch configuration
-Multiple profiles, multiple lines
-Superior voice quality with audio enhancements: Echo canceller (AEC), Automatic Gain Control (AGC), Voice Activity Detection (VAD), Packet Loss Concealment (PLC), automatic QoS, Noise Suppression
-audio codec: G711, G.722, G.723, G726, G729, GSM, iLBC, L16, Speex, wideband and ultra-wideband
-Video Codecs: MJPG, MPEG1, MPEG4, Theora, H263, H264
-Networking autoconfiguration to bypass any NAT and router using UPNP, STUN, ICE, firewall and NAT detection
-Intelligent P2P based network path detection (can call other users even if the server is down)
-VoIP tunneling and encryption bypass any firewall or ISP VoIP blockage
-Call and chat history with voice and video recording
-Remote Desktop and file transfer over VoIP (compatible with any SIP server)
-All standard Class5 SIP features are supported such as voicemail, call forward, call transfer and conference calls (conference are working even without server side support)
-Customized/branded versions are available with support for all major VoIP servers such as Cisco, Asterisk, MizuVoIPServer, Huawei, OpenSER, OpenSwitch, FreeSwitch, Brekeke,VoIPSwitch, Awaya, Siemens and Nortel.

Скачать программу Mizu SIP SoftPhone Free 2.6.0 можно абсолютно бесплатно без регистрации по прямой ссылке на странице загрузки.