IP Wireless Phone can be patched in to a wireless network via it's own wireless network card. IP Video Phone is for use in video conferencing. These models allow you to see as well as hear person(s) on the other end of the line. IP Wireless Video Phone gives you the convenience that a wireless network provides and allows worldwide video calls.
These are different types of services that phones offer, such as the ability to put calls on hold, call waiting, and caller-ID.
Supplementary Service
Call Transfer (H.450.2), Call Hold (H.450.4), Call Pick-up (H.450.5), Call Waiting (H.450.6), Name Identification (H.450.8), Call Intrusion (H.450.11)
Buttons
Redial, Mute, Hold, Transfer, Conference
Some IP phones come with extra features such as a phonebook, SMS messaging, or a built in answering machine.
Additional Features
Hand Free Mode, Speaker, Voice Mail