VoIP SIP SDK provides a powerful and highly customizable solution.
Is adds quickly SIP based dial in your software applications.
Provides professional technology for VoIP voice calling.
SIP Communicator - the Java VoIP and Instant Messaging client.
VoIP Bookers offers you quality voIP and sip calls.
3CX System Ltd
Be connected to all your contacts anyhwere anytime with 3CX VoIP Client.
Pacific Image Europe
Low Cost ... High Quality Phone Calls ... Easy to Use and Set Up.
You can test VoIP network, SIP software or hardware.
SipLink is an alone application to work with 3rd party VoIP systems.
SIP VoIP Softswitch with billing for VoIP wholesale, GSM termination, IVR, PBX.
TekPhone is a SIP VoIP Softphone that provides UA agent functions.
jphonelite is an open source Java SIP VoIP audio and video SoftPhone.
E-Soft Billing (Pvt.) Ltd.
SIP Mobile Dialer is designed for small and mid size VoIP/SIP providers.
OctroTalk is an integrated instant messaging application VoIP call, SIP call etc.
A basic SIP Softphone that allows to connect to VoIP PBX and providers.
Configure SIP accounts, perform VoIP phone calls or initiate audio conferences.
A sip softphone for making and receiving VoIP calls.
PortSIP Solutions, Inc.
PortGo is the newest SIP softphone from PortSIP, it's built base on PortSIP VoIP.
ABTO VoIP SIP SDK installation includes a number of finished softphone samples.