Aastra Telecom Dialog 4000 - Manual (Page 2)

Features
• Easy migration to IP telephony
• Elegant design and superior ergonomics
• Compliance with environmental standards
• Easy operation and maintenance
• User mobility (free seating)
Models
• Dialog 4420 IP Basic
• Dialog 4422 IP Office
• Dialog 4425 IP Vision
Excellent Voice Quality and Telephony Services
• Support for Aastra MX-ONE™, BusinessPhone, and MD
Evolution telephony systems
• Speaker for monitoring calls and listening to telephony
services (for example, interactive voice systems, news and
weather forecasts)
• Equipped with hearing aid support and acoustic shock
protection
• Quality of service (QoS): Packet prioritization for speech and
signaling according to DiffServ. Layer 2 QoS
* Aastra BusinessPhone only supports Dialog 4422 and Dialog 4425.
Telephony System Minimum Requirements
Aastra MX-ONE™ Telephony Server 2.0 or Telephony Switch
Aastra BusinessPhone* Version 7.0
Aastra MD Evolution/EBN Version 8.0 c
Call Features
Emergency call support
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Fixed number assignment
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Monitor speaker
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Mute function

Volume control

Programmable ringtones (max. volume >72dBA) 10
Speed dialing

Increased volume for users with impaired hearing

Acoustic shock protection: ETS 300 245-2

VoIP Features
DHCP*

RTP, IETF RCF 3550t

Quality of Service, IEEE 802.1p&q and DiffServ

VLAN support IEEE 802.1p&q

Support for codecs G.711 PLC, G.729a, G.729ab, G.723.1

H.323 V4

Branch office survivability support

SIP support

Support for encrypted media stream (SRTP)
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* Dialog 4420 IP Basic requires DHCP. Fixed IP address is not supported on this specific model.
Dialog 4425 IP Vision
version 2
Dialog 4422 IP Office
version 2