The table below details several features and specifications of the A-Series IP Phones.
Please also review the A-Series IP Phones Datasheet for additional detail.
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.
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A20
Entry-level
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A22
Entry-level gigabit
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A25
Mid-level gigabit
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A30
Executive-level gigabit
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Line Registrations
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2
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2
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4
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6
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Feature Keys
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1
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1
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5
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7
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Rapid Dial/BLF
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1 key
1 contact
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1 key
1 contact
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6 keys
30 contacts
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10 keys
45 contacts
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Ethernet LAN and PC port
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10/100 BASE-T
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10/100/1000 BASE-T
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10/100/1000 BASE-T
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10/100/1000 BASE-T
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Display
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2.8” color
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2.8” color
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Main: 2.8” color
BLF: 2.4” color
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4.3” color
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Power over Ethernet (PoE)
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Yes
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Yes
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Yes
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Yes
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Electronic Hookswitch Support
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Yes
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Yes
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Yes
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Yes
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Context-Sensitive Soft Keys
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4
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4
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4
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4
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Navigation Controller
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5-way
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5-way
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5-way
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5-way
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Additional Buttons
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Headset, speaker, and mute keys
Volume control
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Headset, speaker, and mute keys
Volume control
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Headset, speaker, and mute keys
Volume control
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Headset, speaker, and mute keys
Volume control
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LED Message-Waiting Indicator
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Yes
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Yes
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Yes
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Yes
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Connections
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- 4P4C (RJ-9) handset jack
- 4P4C (RJ-9) headset jack
- 2 switched 10/100 Mbps Ethernet ports
- 5-volt DC power port
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- 4P4C (RJ-9) handset jack
- 4P4C (RJ-9) headset jack
- 2 switched 10/100/1000 Mbps Ethernet ports
- 5-volt DC power port
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- 4P4C (RJ-9) handset jack
- 4P4C (RJ-9) headset jack
- 2 switched 10/100/1000 Mbps Ethernet ports
- 5-volt DC power port
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- 4P4C (RJ-9) handset jack
- 4P4C (RJ-9) headset jack
- 2 switched 10/100/1000 Mbps Ethernet ports
- 12-volt DC power port
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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
SIP / VoIP Support
- SIP v2
- SDES Secure RTP
- DTMF, RFC2833
- SIP peer-to-peer
- SIP presence (Subscribe/Notify)
- Per-account digit map/dial plan
- Dial using SIP server
- Secure SIP authentication
Provisioning
- DHCP Option 66
- XML Configuration
- Phone GUI
- Phone UI
Management
- Digest authentication login to phone web UI
- Firmware update via browser
- Factory restore via GUI
- Remote logging via Syslog
Audio Features
- Handset, speaker, and headset modes
- Full-duplex HD speakerphone with echo cancellation
- Hearing aid compatible
- Wideband: G.722 on all models. The A30 also supports Opus.
- Narrowband: G.711 ulaw/alaw, G.726 and G.729a on all models. The A30 also supports iLBC.
- Background noise suppression
- Multicast audio playback
Network Support
- Static or DHCP IP address assignment
- NTP time synchronization
- Priority queueing
- Manual and LLDP-assigned VLAN
- NAT traversal
- QoS
- 802.1X authentication
Language Support
- Dutch (A20/22/25 only)
- English
- French
- German
- Italian
- Portuguese (A20/22/25 only)
- Russian
- Spanish
