1)   Webrequest Telephonvalidierung VoIP-Webservice
They have a on-line Shop, a forum, a contact stock exchange or a similar Community in the InterNet and place again and again disappointed firmly that people with wrong data announce themselves.
voip, tariff comparison, shop, security, mobile, downloads, down load, sip, iax, tool,

 2)   Webrequest Callback-Button VoIP-Callbutton
A client clicks on the call-back-button, types in his number, will be called back from the server and at the same time the server calls the website-operator and finally connects them.
voip, tariff comparison, shop, security, mobile, downloads, down load, sip, iax, tool,