Aastra 6755i (55i)

Quantity Pricing:

List Price: $239.95


Aastra 6755i (55i)

The 55i has been discontinued by the manufacturer. The recommended replacements are the 6867i or the 6735i .

Aastra 6755i - Features*

  • Up to 9 call appearance lines
  • Shared Call and Bridged Line Appearances
  • Multi-proxy support
  • XML browser
  • Local 3-way conference
  • Digium’s Asterisk Business Edition – supports Busy Lamp Field (BLF), Intercom
  • BroadSoft’s BroadWorks enhanced SIP – supports Shared Call Appearances, Busy Lamp Field (BLF), CommPilot Call Manager
  • Nortel’s MCS 5100/5200 SIP supports – Conferencing, Voicemail, and NAT Traversal
  • Sylantro’s SIP – supports Bridged Line Appearances (BLA), ComСierge, Call Park/Pickup, Conference

* Feature availability dependant on IP telephony systems

Aastra 55i - Overview

XML Browser
The Aastra 55i is equipped with XML browser capabilities and a large display with dynamic soft keys to easily access customized services and applications. Create internal service applications using development guides available from Aastra. This feature provides unlimited potential to customize the 55i to meet your specific business needs or vertical applications using the display and keypad.

Enhanced Call Management
With extensive storage capacity for personal directories, callers logs and redial lists and 12 programmable keys, the Aastra 55i can improve efficiency by providing more call information with the push of a button. Features such as shared call and bridged line appearances, call forward, call transfer, call waiting, intercom and local 3-way conference increase call flexibility and control.

The Aastra 55i supports up to three Aastra 536M modules, each offering 36 keys with LED indicators to create a feature rich attendant console.

Remarkable Audio
All Aastra IP telephones offer full-duplex speakerphone with excellent voice clarity and delivery. With years of experience in telecommunications and telephone design, Aastra can ensure superior voice quality on every product we sell.

Simplified Deployment
From initial deployment and configuration to future enhancements and upgrades, the Aastra family of IP telephones are designed to save your business time and money. Dual auto-sensing switched Ethernet ports eliminate additional wiring and simplify installations. Integrated IEEE 802.3af Power-over-Ethernet allows easy deployment with centralized powering and backup. Easily created configuration files, using any text editor, can be used to configure phones individually or centrally.

Aastra 6755i (55i) Specifications

  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 foot stand
  Wall mountable


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


  Hearing aid compatible (HAC) handset
  Full-duplex quality speakerphone
  Modular headset connector with built-in 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 soft keys 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


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


  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


  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


  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


  Aastra 536M – 36-keys paper label expansion module
  A1736-0000-10-55 (Universal)
  Optional mid span 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 Foot stand
  AC wall adapter
  Network cable
  Programmable keys label
  Installation Guide
  Wall mount kit


  ROHS compliant
  WEEE (2002/96/EC)
  CE Mark (89/336/EEC EMC Directive and 73/23/EEC Low Voltage Directive)
  FCC Part 15 Class B
  ICES-003 Class B
  VCCI Class B
  AS/NZS 3548 Class B
  EN55022 Class B
  CISPR22 Class B
  EN61000-4-2, 4-3, 4-4, 4-5, 4-6, 4-8, 4-11
  CAN/CSA C22.2 No. 60950
  EN 60950
  UL 60950-1
  FCC Part 68 (Hearing Aid Compatibility)
  AS/NZS S004
  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)

Aastra 6755i (55i) Resources

Datasheets & Brochures:
Aastra 55i Datasheet (PDF)
Aastra 55i Installation Guide (PDF)
Aastra 55i User Guide (PDF)