Ekiga Alternatives

Ekiga

Ekiga (formerly known as GnomeMeeting) is an open source SoftPhone, Video Conferencing and Instant Messenger application over the Internet. It supports HD sound quality and video up to DVD size and quality.
Because it uses both of the major telephony standards (SIP and H.323), it is interoperable with many service providers and many types of hardware and software.

Main Features

Ease of use with a modern Graphical User Interface
Audio and Video free calls through the internet
Free Instant Messaging through the internet with Presence support
Audio (and video) calls to landlines and cell phones with support to the cheapest service providers
High Definition Sound (wideband) and Video Quality up to DVD quality (high framerate, state of the art quality codec and frame size)
Free of choice of the service provider
SMS to cell phones if the service provider supports it (like the default provider)
Standard Telephony features support like Call Hold, Call Transfer, Call Forwarding, DTMF
Remote and Local Address Book support: Remote Address Book support with authentification using the standard LDAP technology, Local Address support in Gnome (Evolution)
Multi platform: Windows and GNU/Linux
Wide interoperability: Ekiga use the main deployed standards for telephony protocols (SIP and H.323) and has been tested with a wide range of softphones, hardphones, PBX and service providers