No non-linear under voice-port to reslove hissing on NM-HDV

Question

Hello.
I have a trouble with 2MFT on NM-HDV.
I can hear hissing on call.
So, i had configured no non-linear under voice-port, then i can't hear any hissing.
Instead, I can hear echo on call.
How can i fix it?
Regard,
john.

Answer 1

Hell Venky.
Thnak you for your helping.
I tried to configure based on the web site what did you told me.
But i couldn't success it to resolve echo issue.
The voice gate have 12.4(1a) on Cisco 2851.
So the solution to reslove echo doesn't fit in my case.
As i mentioned, normally i can hear noise each i talk another persion. If i stop the conversation i can't hear noise. but i started to talk again, i can hear noise each time.
Thus i tried to disable "no non-linear" parameter, i can hear echo instead noise.
So i should choice if i can hear noise or echo.
And also, i tried to change input gain and output attenuation from -6 to 14, but the each still can hear.
out voip network toplolog is below.
NEC Digital Phone---NEC PBX---Gateway---(cat6500---MSPP(WAN Area)---cat6500)---Gateway---NEC Digital Phone.
If i make a call using Normal Phone (INot Digital Phone), I can't hear noise. Whenever i can hear noise with NEC Digital Phone.
Here is the option on cisco 2851 with 12.4
2851(config-voiceport)#?
Voice-port configuration commands:
bearer-cap Specify the bear capability
busyout Configure busyout trigger event & procedure
comfort-noise Use fill-silence option
compand-type The companding type for this voice port
connection Specify Trunking Parameters
cptone Configure voice call progress tone locale
default Set a command to its defaults
description Description of what this port is connected to
disc_pi_off close voice path when disconnect with PI received
echo-cancel Echo-cancellation option
exit Exit from voice-port configuration mode
idle-detection Idle code detection for digital voice
input Configure input gain for voice
music-threshold Threshold for Music on Hold
no Negate a command or set its defaults
non-linear Use non-linear processing during echo cancellation
output Configure output attenuation for voice
playout-delay Configure voice playout delay buffer
shutdown Take voice-port offline
threshold Threshold [noise] for voice port
timeouts Configure voice timeout parameters
translate Translation rule
translation-profile Translation profile
trunk-group Configure interface to be in a trunk group
voice-class Set voiceport voice class control parameters
Please advise to me to reslove the problem.
Regard,
john.