SIP Communicator - the Java VoIP and Instant Messaging client.
VoIP SIP SDK provides a powerful and highly customizable solution.
SIP Proxy - survivable remote site telephony (SRST) during disaster recovery.
SIP Workbench is a graphical protocol analyzer and viewer.
Net2Phone SIP Dialer lets you make phone calls using your computer.
TekSIP is a SIP Registrar and SIP Proxy for Windows.
Robust SIP ActiveX Phone is a powerful and robust SIP ActiveX phone client.
E-Soft Billing (Pvt.) Ltd.
SIP Mobile Dialer is designed for small and mid size VoIP/SIP providers.
NDD is a program based on TeamViewer made to provide online NDD customer service.
This software enables voice, video and IM sessions based on XMPP, SIP and IAX2.
Billion Online Technology Ltd.
BOL SIPPhone is the leading SIP dialer, available for private label and logo.
Finarea S.A. Switzerland
Enter your settings in SIP-device and call at the lowest rates available.
OctroTalk is an integrated instant messaging application VoIP call, SIP call etc.
Vietnam Datacommunication Company
VNN-SIP-Fone uses public Internet to establish calls between telephone and PC.
A basic SIP Softphone that allows to connect to VoIP PBX and providers.