A system and method for allowing a person to place a call to another person under the SIP framework when viewing a display portion on a webpage with only one click of a mouse or one press of a keyboard key and using a stand-alone communication program is provided. The above system includes a client end, a server, a service end, an application program obtained from a server, a user-executable portion accessible at the client end on a webpage, a digital certificate authenticated against a digital signature, an active communication channel established between the client end and the service end, a ready message displayed on the webpage, an active communication session established at the client end and the service end, a session key for session registration, and one or more voice communication devices.