ABTO VoIP SIP SDK - http://www.abtollc.com/SIP-VoIP.aspx
Provides a software development kit for adding SIP calling features to applications. |
Adore Softphone - http://www.adoresoftphone.com
Provides SIP softphone, web-to-phone, and click-to-call software. |
Eyeball Inc. - http://www.eyeball.com
Provides SIP client software, server software, and software development kits. |
http://www.qutecom.org/ - http://www.qutecom.org/
Provides a cross-platform, open source softphone. Includes a mailing-list and a wiki. |
Iscoord AG - http://www.iscoord.com
Provides SIP softphones for service providers, integrated with Microsoft's UC platform, IBM's Lotus Notes and Sametime. |
Media5 Corporation - http://www.m5t.com
Provides SIP products and applications for service providers and enterprise networks. |
PhonerLite - http://www.phonerlite.de
Offers SIP softphone freeware for Windows. English and German instructions. |
Vidosystem - http://www.vidosystem.com
Provides a SIP softphone and a SIP-compatible audio codec. |
Voice Operator Panel - http://www.voiceoperatorpanel.com
Provides a SIP softphone with switchboard for receptionists. |