55i | - Advanced Featured—Expandable VoIP Telephone
- 9 Call Appearance Lights with Shared Call and Bridge Line Appearances
- Expandable—Supports up to 3 M536 Expansion Modules
- Multi-Proxy Support
- Distinctive Ringing and Priority Alerting
- Embedded XML Browser
- 144x75 Pixels Graphical LCD Display
- Soft White Backlighting
- Full Duplex Speakerphone
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| WTC Hosted Phone System |
57i | - Advanced Fully Featured—Expandable VoIP Telephone
- 9 Call Appearance Lights with Shared Call and Bridge Line Appearances
- Expandable—Supports up to 3 M536 or M560 Expansion Modules
- Multi-Proxy Support
- Distinctive Ringing and Priority Alerting
- Embedded XML Browser
- 144x128 Pixels Graphical LCD Display
- Soft White Backlighting
- Full Duplex Speakerphone
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| WTC Hosted Phone System |
57i CT | - Advanced Fully Featured—Expandable VoIP Telephone with Cordless Handset
- Each 57i CT comes with a corded 57i base station and 1 cordless handset
- 9 Call Appearance Lights with Shared Call and Bridge Line Appearances
- Expandable—Supports up to 3 M536 or M560 Expansion Modules
- Multi-Proxy Support
- Distinctive Ringing and Priority Alerting
- Embedded XML Browser
- 144x128 Pixels Graphical LCD Display with Soft White Backlighting
- Full Duplex Speakerphone
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| WTC Hosted Phone System |
M670i | - Aastra 5i Series Expansion Module
- 36 Keys with LED
- Paper Strip Labeling
- Supported on 55i, 57i and 57i CT (up to 3 units)
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| WTC Hosted Phone System |
M675i | - Aastra 5i Series Expansion Module
- 60 Keys with LED (3 pages with 20 on each page)
- Self-Labeling LCD Backlit Display
- Supported on 57i and 57i CT (up to 3 units)
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| WTC Hosted Phone System |