METHOD FOR CALL WAITING SERVICE IN A TWO WAY CT2
Original Publication Date: 1995-Jul-01
Included in the Prior Art Database: 2002-Mar-25
Call waiting is a supplementary service which existing PSTNs already provide for wire-line phones and mobile phones. If the telephone subscribes to this service and if there is an incoming call while the telephone is busy, in-band signalling in the form of short beeps are introduced into the voice channel of the called user. (The calling user hears a ring back instead of the normal busy tone). Called user can switch between the two calls using the "flash" (recall) function.