The cisco unified wireless ip phone 7921g supports a host of calling features and voice quality enhancements including ieee 80211a b and g standards a larger 2 inch color display 176 x 220 tft speakerphone capabilities a new combination charger and speakerphone stand dedicated keys for push to talk mute and volume longer battery life 90 hours standby time an intelligent wireless infrastructure can help you extend advanced voice and unified communications capabilities acr