Aastra 6753I User manual

1
EHS support
Aastra 6753i, 6755i and 6757i phones
May 2009
Your Connection to the World.

2
Agenda
»Introduction
»EHS (Electronic Hook Switch)
»DHSG Standard
»Aastra DHSG cable Kit
»Ordering and pricing
»List of verified/compatible headsets
»Recommended settings on the phone

3
Introduction
»Mechanisms to remotely control the hook switch when using a wireless
headset:
– RHL (Remote Handset Lifter): Motor based,
works with almost all phones, no special
requirements on the phone side
– EHS (Electronic Hook Switch)
Requires common protocol to be supported by the phone & headset.
Different standard exists
– Bluetooth Connectivity
Requires native BT support in the phone, headset connects directly to phone

4
EHS (Electronic Hook Switch)
»In addition to audio path, EHS requires some additional cables to carry
signaling between phone and headset base station
»Supported features:
– Phone signals incoming call to headset (beep in headset)
– Headset button allows to send off/on hook command to phone
– Phone signals call active / call inactive to headset, headset will unmute/mute
mic and turn on/off link-LED
»Different EHS versions exist:
– DHSG
– AEI (Avaya Tenovis)
– MSH (Alcatel Lucent)

5
DHSG Standard
»DHSG: “Drahtlose Hörsprechgarnitur” (German for “wireless headset”)
»Also knows as “Siemens standard”
»Supported by many phone vendors
»Often referred to as “The EHS-Standard”
»Phone vendors supporting it:
– Aastra: Office IP 70/80, Open Phone 71/73/75 and now also 6753i, 6755i and 6757i
–Polycom
– Snom
– Cisco
– Siemens
– Avaya
–Swyx
– Agfeo
–Elmeg
–Tiptel
–…

6
DHSG Interface
»Mechanical Interface: RJ-45
– RJ45 carries voice and signaling
– No native EHS/RJ45 interface on 675xi
1
2
3
4
5
6
7
8
Send Bus
0V
Mic Signal
Speaker Signal
Speaker Signal
Mic Signal
DC in
Receive Bus
»Aastra work around is to utilize existing Expansion module port & Headset jack to
support DHSG on Aastra 675xi phones
»Aastra has designed a special “Y” cable that allows connectivity between the
phone and Headset base
»Important:
»Solution only supported on 6753i, 6755i and 6757i models
»Phones Require software release 2.4 or higher
»DHSG + usage of an expansion module is not possible!

7
Connecting the Aastra DHSG Cable Kit
1.- Connect the Aastra DHSG Cable on the back of the phone
Only the Aastra DHSG cable should be connected directly to your phone. No 3rd party DHSG cables
should be connected directly to the Aastra IP phone.
Any damage caused by connecting a 3rd party DHSG headset cable to your phone will void your
warranty with Aastra Telecom.
Only the Aastra DHSG cable should be connected directly to your phone. No 3rd party DHSG cables
should be connected directly to the Aastra IP phone.
Any damage caused by connecting a 3rd party DHSG headset cable to your phone will void your
warranty with Aastra Telecom.
!

8
Connecting the Aastra DHSG Cable Kit
2.- Connect the blue end of the cable to the RJ-45 coupler (included in the Kit), and connect
the EHS cable provided by the headset manufacturer to the other side of the coupler
Only the Aastra DHSG cable should be connected directly to your phone. No 3rd party DHSG cables
should be connected directly to the Aastra IP phone.
Any damage caused by connecting a 3rd party DHSG headset cable to your phone will void your
warranty with Aastra Telecom.
Only the Aastra DHSG cable should be connected directly to your phone. No 3rd party DHSG cables
should be connected directly to the Aastra IP phone.
Any damage caused by connecting a 3rd party DHSG headset cable to your phone will void your
warranty with Aastra Telecom.
!

9
Ordering and Packaging
»DHSG Cable Kit
»Part Number: D0062-0011-34-00
»Pricing: 19€ (Street Price)
»Content:
– Aastra DHSG Cable
– RJ-45 coupler
– Installation Instructions (engl)
Important:
– This cable is only compatible with 6753i, 6755i and 6757i models
– Phones require software release 2.4 or higher
– DHSG + usage of an expansion module is not possible!

10
Relevant settings on the Phone
»The phone will auto-detect the DHSG headset
»But audio mode needs to be set to “Headset/Speaker” mode manually.
(OptionsÆPreferencesÆSet AudioÆAudio ModeÆHeadset/Speaker)
»For full headset functionality, disable the "Goodbye Key Cancels
Incoming Call" parameter.
Aastra Web UI: Basic SettingsÆPreferencesÆGeneral