Robust SIP ActiveX Phone is a powerful and robust SIP ActiveX phone client.
Enables voice connections to landline , cellular network and VoIP.
SIP Communicator - the Java VoIP and Instant Messaging client.
3CX System Ltd
Be connected to all your contacts anyhwere anytime with 3CX VoIP Client.
Billion Phone - compact convenient SIP phone software for making voice calls.
Myvoipapp Sip Phone is a usefull tolls easy to use.
Nindino is a virtual phone client for your desktop.
Pc-to-phone client developed to make calls from your PC all around the world.
Aircelvoice is a Pc-2-Phone client that will help you make the cheapest calls.
Net2Phone SIP Dialer lets you make phone calls using your computer.
Configure SIP accounts, perform VoIP phone calls or initiate audio conferences.
A free SIP Softphone which offers PC-to-Phone service.
New generation phone system working in IP-networks using SIP protocol.
It enables you to make voice and video phone calls using SIP-based standards.
PortSIP Solutions, Inc.
PortGo Professional is a SIP-based phone for Windows desktop.