Description
| Firmware upgrades | You can download firmware changes from Cisco.com |
| Software upgrades | Software upgrades are supported with a Trivial File Transfer Protocol (TFTP) server |
| Dimensions (H x W x D) | Cisco Unified IP Phone 6921: 164 x 188 x 205 mm (6.4 x 7.4 x 8.1 in.) |
| Weight | Cisco Unified IP Phone 6921: Standard: 1031g (36 oz); Slimline: 940g (33 oz) |
| Phone casing composition | Polycarbonate acrylonitrile butadiene styerene (ABS) plastic |
| IEEE 802.3af PoE | The phones can receive power from IEEE 802.3af-compliant blades |
| Operating temperature | 32 to 104ºF (0 to 40ºC) |
| Relative humidity | 10 to 95% (noncondensing) |
| Storage temperature | 14 to 140ºF (-10 to 60ºC) |
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