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You may also wish to visit the A-Series Phones for Asterisk Product Page or our A-Phones Overview support article for links to related resources.
| A20 Entry-level | A22 Entry-level gigabit | A25 Mid-level gigabit | A30 Executive-level gigabit |
Line Registrations | 2 | 2 | 4 | 6 |
Feature Keys | 1 | 1 | 5 | 7 |
Rapid Dial/BLF | 1 key | 1 key | 6 keys | 10 keys |
Ethernet LAN and PC port | 10/100 BASE-T | 10/100/1000 BASE-T | 10/100/1000 BASE-T | 10/100/1000 BASE-T |
Display | 2.8” color | 2.8” color | Main: 2.8” color BLF: 2.4” color | 4.3” color |
Power over Ethernet (PoE) | Yes | Yes | Yes | Yes |
Electronic Hookswitch Support | Yes | Yes | Yes | Yes |
Context-Sensitive Soft Keys | 4 | 4 | 4 | 4 |
Navigation Controller | 5-way | 5-way | 5-way | 5-way |
Additional Buttons | Headset, speaker, and mute keys | Headset, speaker, and mute keys | Headset, speaker, and mute keys | Headset, speaker, and mute keys |
LED Message-Waiting Indicator | Yes | Yes | Yes | Yes |
Connections |
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Phone Features
Auto-answer
Headset-answer
Headset-ring
Distinctive ring
Call waiting
Call transfer (blind & attended)
Call forward
Call hold
Intercom / Paging
Message Waiting Indication (MWI)
Busy Lamp Field (BLF)
3-way conferencing
Do Not Disturb (DND)
Redial
Call timer
Caller ID display
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