Block microphone noise.
Make free USA/Canada calls on PC and Android devices using Google Voice and IPKALL.
Develop SIP based VoIP server for IVR, IP telephony, and call centers.
Chat with your friends and set up video conferences over a secure connection.
Develop SIP based Web phone with your own GUI and brand.
Track EMS audio streams and police dispatch across the Internet.
Talk with friends and family for free over the Internet.
Send free messages as well as make free calls to other Viber users, on any device and network, in any country.
Communicate from anywhere with an Internet connection.
Make cheap phone calls.
Record Skype video and audio calls into MP4 / AVI movies.