Call jabra and complain, ask them for specific compatibility settings try plantronics or similar to see if that works , if you are saying the volume is okwhen talking on the handset you have really answered your own question.
The below are all settings in the 46xx settings file that you can play with , but i still think you should contact jabra as a first port of call , then try a different headset , upgrade the phones to the latest firmware , then read the lan admin guide get an understanding fro the below settings and logically change as required to see if improvement can be achieved
also these settings in the 46xx settings file.
## HEADSETBIDIR specifies whether bidirectional signaling
## on the headset interface will be enabled or disabled.
## Value Operation
## 0 Disabled (default)
## 1 Switchhook and alerting signaling are both enabled
## 2 Only switchhook signaling is enabled
## This parameter is supported by:
## 96x1 H.323 R6.3 and later (values 0-2)
## 96x1 H.323 R6.2.1 and later (values 0-1)
## Note that 96x1 H.323 R6.2 only supported signaling for alerting.
## SET HEADSETBIDIR 1
## Audio Environment Index
## Enables you to customize the telephone's audio
## performance. (0-299) This parameter affects settings
## for AGC dynamic range, handset and headset noise
## reduction thresholds, and headset transmit gain. It is
## highly recommended you consult Avaya before changing
## this parameter.
## SET AUDIOENV 0
## AUDIOSTHD specifies the level of sidetone in the headset.
## Value Operation
## 0 NORMAL level for most users (default)
## 1 three levels softer than NORMAL
## 2 OFF (inaudible)
## 3 one level softer than NORMAL
## 4 two levels softer than NORMAL
## 5 four levels softer than NORMAL
## 6 five levels softer than NORMAL
## 7 six levels softer than NORMAL
## 8 one level louder than NORMAL
## 9 two levels louder than NORMAL
## SET AUDIOSTHD 1
##
## WMLHOME specifies the URL of a WML page to be displayed by default in the WML browser,
## and whenever the Home softkey is selected in the browser.
## The value can contain zero or one URL of up to 255 characters; the default value is null ("").
## If the value is null, the WML browser will be disabled.
## SET WMLHOME
##
## WMLIDLEURI specifies zero or one URL for a WML page to be displayed when the telephone
## has been idle for the number of minutes specified by the value of WMLIDLETIME.
## The value can contain up to 255 characters; the default value is null ("").
## SET WMLIDLEURI
##
############# End of 4622 model-specific settings ##########
GOTO GROUP_SETTINGS
##############################################################
##
# SETTINGS4625
##
########## Add settings for 4625 telephones below ##########
##
## AUDIOSTHS specifies the level of sidetone in the handset.
## Value Operation
## 0 NORMAL level for most users (default)
## 1 three levels softer than NORMAL
## 2 OFF (inaudible)
## 3 one level softer than NORMAL
## 4 two levels softer than NORMAL
## 5 four levels softer than NORMAL
## 6 five levels softer than NORMAL
## 7 six levels softer than NORMAL
## 8 one level louder than NORMAL
## 9 two levels louder than NORMAL
## SET AUDIOSTHS 1
##
## AUDIOSTHD specifies the level of sidetone in the headset.
## Value Operation
## 0 NORMAL level for most users (default)
## 1 three levels softer than NORMAL
## 2 OFF (inaudible)
## 3 one level softer than NORMAL
## 4 two levels softer than NORMAL
## 5 four levels softer than NORMAL
## 6 five levels softer than NORMAL
## 7 six levels softer than NORMAL
## 8 one level louder than NORMAL
## 9 two levels louder than NORMAL
## SET AUDIOSTHD 1
#################### AUDIO SETTINGS ######################
##
## Automatic Gain Control (AGC).
## These settings enable or disable AGC.
##
## A value of 1 (default) enables AGC. A value of 0 disables AGC.
## AGCHAND controls handset AGC. Not supported on 16CC phones.
## AGCHEAD controls headset AGC
## AGCSPKR controls speaker AGC. Not supported on 16CC phones.
## Note: AGCHAND and AGCSPKR are applicable for 1603 SIP phone.
## SET AGCHAND 0
## SET AGCHEAD 0
## SET AGCSPKR 0
##
## Audio Environment Index
## Enables you to customize the telephone's audio
## performance. (0-299) This parameter affects settings
## for AGC dynamic range, handset and headset noise
## reduction thresholds, and headset transmit gain. It is
## highly recommended you consult Avaya before changing
## this parameter.
## SET AUDIOENV 0
APSS (SME)
ACSS (SME)
ACIS (UC)
