Dialog 4425 IP Vision
version 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
Dialog 4422 IP Office
version 2
Excellent Voice Quality and Telephony Services
•Support for Aastra
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
Telephony System | Minimum Requirements |
Aastra | Telephony Server 2.0 or Telephony Switch |
Aastra BusinessPhone* | Version 7.0 |
Aastra MD Evolution/EBN | Version 8.0 c |
* Aastra BusinessPhone only supports Dialog 4422 and Dialog 4425.
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 | |
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.
