VaxVoIP SIP SDK
VaxVoIP SIP SDK to develop web/soft phone.
VaxVoIP SIP SDK to develop web/soft phone.
SIP Softphone ActiveX
Softphone SDK, SIP SDK, VOIP SDK, Softphone
Freeware SIP VoIP video softphone for Windows
MizuPhone -free VoIP softphone for Windows
Repeatedly checks busy line until it's free.
skype auto dialer, phone dialer
.Net SDK for C# SIP WPF softphone development
SIP SDK to develop softphone with call record
ABTO Software Flash SIP Softphone SDK