Call transfer is an accessAccess is the method or facility used to enter the LEC or network is the access. There are two types of access services; switched access, and special access. service provided by most LECs which allows the subscriber to transfer an incoming call to another phone within a CentrexCentrex is a service provided by a central office that provides a virtual PBX to a set of extensions. It offers features such as transfer, conference, and forward within that set of extensions. system or outside the system.  Next, place or answer a call from line with added call transfer feature. Then depress flash button or switchhook. Next listen for special dial tone (usually 3 beeps followed by a dial tone). Dial third party’s number, then when they answer, either notify them you are transferring a call or hang up.