CounterPath X-Lite 4.7 for Windows User Guide - Manual (Page 5)

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1 Introduction
X-Lite is a softphone from CounterPath that enables you to make VoIP voice and video calls, send and receive
instant messages, share online status (presence) information, and exchange files.
Standard Telephone Features
The CounterPath X-Lite softphone has all standard telephone features, including:
• Call display and Message Waiting Indicator (MWI).
• Speakerphone and Mute.
• Redial, Hold, Do Not Disturb.
• Call history – list of received, missed, and dialed calls.
• Three-party audio conferencing.
• Three-party video conferencing.
Enhanced Features and Functions
X-Lite also supports the following features and functions:
• Video
• IM and presence using the SIP SIMPLE protocol.
• Contact list containing the individual user’s contacts.
• Support for DTMF (RFC 2833 or inband DTMF).
• Automatic detection and configuration of audio and video devices.
• Acoustic echo cancellation, automatic gain control, voice activity detection.
• Support for the following audio codecs:
Broadvoice-32, G.711aLaw, G.711uLaw, G.722, iLBC, OPUS, Speex, Speex Wideband.
• Support for the following video codecs:
H.263, H.263+ 1998.
• Automatic selection of the best codec based on the other party’s capability, the available bandwidth, and
network conditions. X-Lite switches the codec within a call in response to changing network conditions.
• For SIP and open standards to which X-Lite is compliant, visit http://www.counterpath.com/sip.html
• Compliance to 3261 SIP standard.
• Support for these firewall traversal solutions: STUN, TURN, or ICE.