It lets you make audio and video calls over the Internet to people who have hardware or software that follows the SIP or H.323 standards and also features basic instant messaging. It is compatible with Windows Messenger and most VoIP applications. However, Ekiga cannot communicate with Skype because the latter uses proprietary technology. If you have the right SIP provider, you can also use Ekiga to place calls to any normal phone line.
to install ekiga click link below :
click : Install the ekiga package
or isntall using terminal :
~$ sudo apt-get install ekiga
To start Ekiga, choose Applications ▸ Internet ▸ Ekiga Softphone.
H.323 and SIP compatible videoconferencing and VoIP/IP-Telephony application that allows you to make audio and video calls to remote users with H.323 hardware or software (such as Microsoft Netmeeting) as well as SIP endpoints.
It supports all modern videoconferencing features, such as contact roster, presence status, high-quality audio and video codecs, various video resolutions, registering to an LDAP directory, gatekeeper support, making multi-user conference calls using an external MCU, using modern Quicknet telephony cards, and making PC-To-Phone calls.
ekiga setting in 8 step to complete, follow instruction.
To Using VoIP is like using electronic mails you must register at https://www.ekiga.net/ SIP Service. to used this software, it's free.