| Avaya I2001 Phone | Avaya I2002 Phone | Avaya I2004 Phone | Avaya 1120e Phone | Avaya 1140e Phone | |
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| Ideal For | Courtesy Phone, lunch room, server room, shipping area | Intermediate-level Call / Applications Usage | Intermediate-level Call / Applications Usage | Professional-level Call / Applications Usage | Professional-level Call / Applications Usage |
| # of Lines | 1 | 4 | 6 | 4 | 6 |
| Display Size / Type | 3x24 Character LCD | 4x24 Character LCD | 8x24 Character LCD | 240x80 Pixels Grayscale & Backlit LCD | 240x160 Pixels Grayscale & Backlit LCD |
| Feature Keys (Excluding Enter + Navigation Cluster) |
11 | 22 | 21 | 24 | 24 |
| Headset Jack | 0 | 1 | 1 | 1 | 1 |
| Bluetooth Headset | No | No | No | No | Yes |
| Handsfree | Listen only | Half Duplex | Full Duplex | Premium Full Duplex | Premium Full Duplex |
| 802.3af Power Classification | Class 2 | Class 2 | Class 2 | Class 3 | Class 3 |
| Integrated Switch | No | Yes (10/100) | Yes (10/100) | Yes (10/100/1000) | Yes (10/100/1000) |
| USB Ports | 0 | 0 | 0 | 1 | 1 |
| User Guide | Download | Download | Download | Download | Download |
