SIP - Musharof Chy
Eyeball Inc.
Provides SIP client software, server software, and software development kits.
Adore Softphone
Provides SIP softphone, web-to-phone, and click-to-call software.
Media5 Corporation
Provides SIP products and applications for service providers and enterprise networks.
PhonerLite
Offers SIP softphone freeware for Windows. English and German instructions.
Voice Operator Panel
Provides a SIP softphone with switchboard for receptionists.
ABTO VoIP SIP SDK
Provides a software development kit for adding SIP calling features to applications.
Iscoord AG
Provides SIP softphones for service providers, integrated with Microsoft's UC platform, IBM's Lotus...
Kapanga Softphone
Provides SIP video communications for desktop (Windows, Linux) and mobile (Windows Mobile and Andro...
TekIVR
A SIP (Based on RFC 3261) Interactive Voice System (IVR) running under Windows.
Acrobits Mobile VoIP solutions
A mobile software development company with a focus on SIP clients for mobile devices.