CounterPath X-Lite 4.6 for Mac 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. X-Lite implements SIP-based
standards for phone calls, IM and presence, allowing you to work with different VoIP service providers. X-Lite
also uses XMPP-based standards for IM and presence.
Standard Telephone Features
The CounterPath X-Lite for Mac 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.
• Auto answer.
• Five-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 or the XMPP protocol.
• Contact list containing the individual user’s contacts
• Automatic detection and configuration of audio and video devices.
• Acoustic echo cancellation, automatic gain control, voice activity detection.
• Support for DTMF (RFC 2833 or inband DTMF).
• Support for the following audio codecs:
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.
• Compliance to 3261 SIP standard.
• Support for these firewall traversal solutions: STUN, TURN, or ICE.