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
Fixed number assignment
Monitor speaker
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)
* 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
