Physical
» 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)
» 4 positions footstand
» Wall mountable

Power
» AC wall adapter included
» Integrated IEEE 802.3af Power Over Ethernet (PoE) support

Audio
» Hearing aid compatible (HAC) handset
» Full-duplex quality speakerphone
» Modular headset connector with builtin amplifier
» Non-amplified business headsets are recommended

Display and Indicator
» 144x75 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

Feature Keys
» 4 call appearance lines with LEDs
» 4 navigational keys
» 6 customizable softkeys with LEDs, programmable up to 20 functions
» 6 programmable keys with LEDs
» 8 predefined hard keys
- Goodbye
- Options
- Hold
- Redial
- Speakerphone/Headset toggle
- Mute
- 2 volume keys

Security
» User and administrator level passwords
» Encryption of configuration files
» HTTPS configuration download and web management
» Phone lock with PIN

Interoperability
» Visit www.aastratelecom.com/IPphones for an up to date listing of approved vendor/interoperability

Expansion Module
» Aastra 536M – 36-keys paper label module with LEDs
- Scalable up to 3 modules or 108 keys
- No additional external power required; direct power from phone

Localization
» Multi-lingual support – English, French, Spanish, Italian, German
- Downloadable language pack support for customization and additional language translations
» Country-specific call progress tones and cadences

Protocols / Codecs
» IETF SIP (RFC3261 and associated RFCs)
» G.711 μ-law / A-law
» G.729

Networking
» Dual 10/100 Mbps switched Ethernet ports
» Manual or Dynamic Host Configuration Protocol (DHCP) IP address setup
» Time and date synchronization using SNTP
» Quality of Service (QOS) support – IEEE 802.1 p/Q VLAN and priority tagging, Type of Services (TOS), and Differentiated Services Code Point
» Network Address Translation (NAT) support
» Integrated HTTP/HTTPS server for web administration and maintenance including a built-in troubleshooting section
» Mass deployment via central provisioning of user configuration files – TFTP, FTP, HTTP, HTTPS
» Redundant server support
- DNS-SRV
- Local backup registrar and/or proxy server

Accessories
» Aastra 536M – 36-keys paper label expansion module
» A1736-0000-10-55 (Universal)
» Optional midspan Power Over Ethernet (POE) injector available, but not provided, for networks that do not supply power
- D0023-0031-00-00 (North America)
- D0023-0031-PS-00 (International)

Package Contents
» Aastra 55i IP telephone
» Handset and coil cord
» 2x Footstand
» AC wall adapter
» Network cable
» Programmable keys label
» Installation Guide
» Wall mount kit

Regulatory
CE
» ROHS compliant
» WEEE (2002/96/EC)
» CE Mark (89/336/EEC EMC Directive and 73/23/EEC Low Voltage Directive)

EMC
» FCC Part 15 Class B
» ICES-003 Class B
» VCCI Class B
» AS/NZS 3548 Class B
» EN55022 Class B
» CISPR22 Class B
» EN55024
» EN61000-4-2, 4-3, 4-4, 4-5, 4-6, 4-8, 4-11

Safety
» CAN/CSA C22.2 No. 60950
» EN 60950
» UL 60950-1

Telecom
» FCC Part 68 (Hearing Aid Compatibility)
» AS/NZS S004

RF
» FCC Part 15 Class C
» EN 300-328
» EN 301 489
» AS/NZS 4771

Part Numbers
» A1755-0131-10-05 – North America (120V power adapter)
» A1755-0131-10-55 – International (Universal power adapter)