The IQ335 Caller ID telephone is a high-quality PABX or Direct Line business telephone as it offers visual message waiting for indication, high-quality speakerphone, and soft-programmable network feature keys. It allows the users a wide choice of headset types to suit personal tastes as it provides a built-in headset amplifier that suits many headset models. The IQ335 is a great product for the busy office or home as it also provides Caller ID name/number display, 120 names/number memories, and missed calls indicator.