Yate:Free calls to USA/Canada using Google Voice SIP from anywhere

Google Voice is a must have service which offers free sms, conference calls, voice mail transcription, cheap international calls and mobile number porting. Google Voice is only available to users from USA. There are few clients available which allows you to use Google Voice through SIP protocol. Today we will discuss about Yate (Yet Another Telephony Engine) which allows you to use Google voice account through SIP from anywhere.

Linphone SIP software for Ubuntu Linux XP Vista and Mac : free VoIP video-phone

Linphone is an open source free SIP softphone, video phone which works with major operating systems like Ubuntu Linux XP Vista and Mac and allow you to register multiple SIP accounts with single sip software.