| Specification |
| Physical / 6757i CT Base | 4 adjustable footstand positions |
| Wall mountable |
| 23.5 cm W x 20.8 cm D x 8.0 cm H (9.3"W x 8.2"D x 3.2"H) |
| 940 g (33.0 oz) |
| Physical / 6757i CT Cordless Handset | 13.7 cm L x 4.6 cm W x 1.9cm H (5.4"L x 1.8"W x 0.8"H) |
| 133 g (4.7 oz.) |
| Power / 6757i CT Base | AC wall adapter included |
| Integrated IEEE 802.3af Power Over Ethernet (PoE) support |
| Power / 6757i CT Cordless Handset | AC wall adapter for charging stand |
| Nickel Metal Hydride battery - 4 day standby time, 4 hour talktime |
| Display and Indicator / 6757i CT Base | 144x128 pixels graphical LCD display |
| Soft white backlight for user comfort in any lighting environment |
| Configurable for Always On, Always Off, or Auto (power saving) |
| LED for call and message waiting indicator |
| Display and Indicator / 6757i CT Cordless Handset | Large 5 lines backlit display |
| LED for call and message waiting indicator |
| Audio / 6757i CT Base | Hearing aid compatible (HAC) handset |
| Full-duplex quality speakerphone |
| Modular headset connector with built-in amplifier |
| Non-amplified business headsets are recommended |
| Audio / 6757i CT Cordless Handset | One handset included; expandable up to 4 handsets |
| 2.4 GHz Frequency Hopped Spread Spectrum (FHSS) |
| Warehouse coverage up to 300,000 sq. feet |
| Vibration alerter |
| 2.5mm headset connector |
| Expansion Module | Aastra 536M - 36-keys paper label module with LEDs |
| Scalable up to 3 modules per 6757i for a total of 108 extra softkeys/LEDS |
| Aastra 560M LCD Module - 20 softkeys for 60 functions per Module |
| Install 3 modules, either 536M or 560M, per phone |
| No additional external power required; Modules powered directly from phone |