Unlike fax machines and computer modems, a Tele-typewriter device (TTY) has no handshake tone and no carrier tone. A TTY is silent when not transmitting. This is why systems cannot identify TTY callers automatically. However, the absence of these special tones also means that voice and TTY tones can be intermixed in prerecorded announcements. The ability to provide a hybrid voice-and-TTY announcement, when combined with the automated attendant vectoring capability, can permit a single telephone number to accommodate both voice and TTY callers.