vaxvoip server sdk provide tools and components to develop sip based voip server
vaxvoip webphone sdk provide tools and components to develop a webphone
Softphone SDK, SIP SDK, VOIP SDK, Softphone, IVR SDK, IMS SDK
SIP SDK - A powerful and highly versatile VoIP SDK for SIP applications
VoIP SIP Client - A powerful and highly versatile VoIP SDK for SIP applications