Aastra 51i is a functional IP phone, equipped with a powerful XML browser, PoE – power over IP, full-duplex high-quality speakerphone, dual-port 10/100 Mb built-in Ethernet switch.

A functional IP phone based on open standards. The phone has a sleek and elegant design and a large LCD display. Aastra 51i is fully compatible with the leading number of IP telephony platforms.
The Aastra 51i has an advanced XML browser built in, which provides powerful and productive access to selected applications. The phone supports the modern IP telephony protocol – SIP and has high voice quality.
Aastra 51i is ideal for use as a lightweight IP phone for small and medium business applications. It can be used in small reception areas, small offices, and can also be used by individual users where high quality communications are required.
The phone has a powerful XML browser that provides access to custom services and settings. Additional internal services can be created using the Aastra XML browser. The phone provides this functionality through a powerful XML browser, which allows you to create custom settings for specific business applications.
The Aastra 51i has large storage capacity for personal information, call logs, dialing emails and more.
The Aastra 51i effectively displays problem information at the touch of a button. Built-in support for all-call capability and line connection indication, call forwarding, call transfer and call waiting increases flexibility and control over calls.
Built-in dual-port Ethernet switch with auto-sensing for quick and easy installation and setup. Integrated IEEE 802.3af – PoE – power over IP, allowing for easy deployment anywhere. Easy creation of configuration files that can be configured individually or together using any text editor.
Brief technical characteristics of Aastra 51i:
Nutrition:
* Integrated IEEE 802.3af Power Over Ethernet (PoE)

Audio :

* Supports compatibility with any headset (HAC)

* Full duplex high quality speakerphone

Indicators and displays:

* 3-line LCD display
* Indicator for calls and text messages

Keys:

* 1 call availability
* 4 navigation
* 9 configured speed dial keys, number keys are used
* 9 hard-coded keys, plus 2 volume keys
* keys: End call, Services, Hold, Redial, Save, Delete, Edit calls, Speakerphone, Mute.

Protocols and codecs:
* IETF SIP (RFC3261) and related RFCs

* G.711 u-law/A-law, G.729

Region:
* Multi-language support - English, French, Spanish, Italian, German
* Language packs are being downloaded
* Support custom add languages
* Support call progress tones and voice tones

Security:

* Different password levels for administrator and user
* Encryption of configuration files, configurations downloaded via HTTPS and Web management
* Lock your phone with a PIN code
* TLS and SRTP support

Network capabilities:

* Dual-port 10/100 Mbps built-in Ethernet switch
* Manual and dynamic configuration of Hosts
* Protocol (DHCP) IP address setting
* SNTP user date and time synchronization
* QOS support – IEEE 802.1 p/Q, VLAN and priority, Type of Services (TOS), Differentiated Services Code Point, Network Address Translation (NAT) support
* Built-in HTTP/HTTPS server for web administration and maintenance includes a troubleshooting section
* User configuration file promotion - TFTP, FTP, HTTP, HTTPS

* Backup server support
* DNS-SRV
* Support for local configuration restore and/or proxy server

Compatibility certificates:

* 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
* 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)