SipToSis (Sip to Skype integration software) is Java software that allows you to make and receive Skype calls from your SIP/VOIP telephone adapter, SIP IP phone or Asterisk/SIP PBX.
What do I need to use GizmoCall? Internet connected computer with a browser and Flash version 9 or better.
sippyskype is basically a Skype/SIP Bridge/Gateway/Proxy/Adapter/Converter