AASTRA 53i 安装指南

Model 55i IP Phone Installation Guide  1

Introduction

Congratulations on your purchase of the Model 55i IP Phone! The 55i 
communicates over an IP Network, allowing you to place and receive calls 
in the same manner as a regular business telephone. The 55i is capable of 
supporting the SIP IP protocol. 

Phone Features

• 8 line graphical LCD screen (144 x 75 pixels) with white backlight
• 12 programmable keys

— 6 Top keys:

Programmable hard keys

(up to 6 programmable functions)

— 6 Bottom keys: Programmable state-based softkeys

(up to 20 programmable functions)

• 4 call appearance lines with LEDs
• Supports up to 9 call lines
• Full-duplex speakerphone for handsfree calls
• Headset support (modular connector)
• Built-in-two-port, 10/100 Ethernet switch - lets you share a connection 

with your computer. 

• Inline power support (based on 802.3af standard) which eliminates 

power adapters.

• AC power adapter (included)
• Enhanced  busy  lamp fields*
• Set paging*

* 

Availability of feature dependant on your phone system or service provider

Requirements

The 55i IP Phone requires the following environment:
• SIP-based IP PBX system or network installed and running with a SIP 

account created for the 55i phone.

• Access to a Trivial File Transfer Protocol (TFTP), File Transfer Protocol 

(FTP), Hypertext Transfer Protocol (HTTP) server, or Hyper Text Trans-

fer Protocol over Secure Sockets Layer (SSL) (HTTPS).

• 802.3af Ethernet/Fast Ethernet LAN
• Category 5/5e straight through cabling
• Power over Ethernet (PoE) inline power injector (optional accessory - 

necessary only if your network provides no inline power and if you do 

not use the IP Phone’s power adapter).