SIP Clients

linphone

www.linphone.org

  • support linux, android, ios (and sort of windows/mac via awkward GTK ports).
  • actively maintained
  • now supports SRTP and zRTP.

ekiga

ekiga.org
linux (gnome)

Does not support RTP encryption.

You can get a SIP address at ekiga.net

qutecom

QuteCom is the new name of the WengoPhone project
www.qutecom.org
linux (KDE), osx, windows

Pretty and slick, but does not allow multiple accounts.

twinkle

www.twinklephone.com
linux (KDE)

Seems to be the best performing and have the most features, but confusing as hell.

  • multiple sip registrations
  • multiple incoming lines
  • srtp/zrtp
  • good voice quality
  • a million configuration options

jitsi

jitsi.org
Windows, os X, Linux (All Java supported)

Seems the most portable and easy to install.

  • Audio/video over XMPP-Jingle and SIP
  • Supports a lot of instant messaging protocols
  • Call encryption with SRTP and ZRTP

blink

icanblink.com

  • linux, osx, windows
  • multiple sip registrations
  • TLS encryption for signaling and media
  • Video, audio, chat
  • Under development

You can get a SIP address at sip2sip.info

x-lite (free for download, eula)

www.counterpath.com/x-lite.html

Runs on linux, osx and windows.

SJphone 1.65 (commercial)

www.sjlabs.com/sjp.html

Runs on Linux, M$, Mac,
But i’m try only in M$

SFLphone

sflphone.org

Runs on Linux only (GNOME,KDE,cli)
provides Signalling and voice encryption (TLS, SRTP)