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Community Member

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

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.

3 REPLIES
Community Member

Re: no non-linear under voice-port to reslove hissing on NM-HDV

Hi John,

A good place to start off is the below link.

http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a0080149a1f.shtml

Let me know how it works

Regards

Venky

Community Member

Re: no non-linear under voice-port to reslove hissing on NM-HDV

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.

Community Member

Re: no non-linear under voice-port to reslove hissing on NM-HDV

NEC Digital Phone---NEC PBX---Gateway---(cat6500---MSPP(WAN Area)---cat6500)---Gateway---NEC PBX---NEC Digital Phone.

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