PCBest Network provides SIP solutions for SIP Developers. From high level SIP ActiveX to low level SIP SDK, the complete SIP development solutions are giving users multipul choices to deploy their voip productions in fastest and most efficient way. PCBest Network's SIP SDK can be used to develop SIP clients or Servers(proxy, media gateway, PBX, or any other apps). Samples and libs are downloadable from PCBest Network's website(www.pcbest.net).