Hi bawajan,
I have listened to the files. What I can hear is a constant stationary noise.
Usually the origin of such noise is hardware issues (mic/cables/etc.).
If you are unable to find & fix the source of the problem, you can use noise cancellation software that will easily remove this noise.
One software that you can try is PBXMate. A usage example is available on FreeSWITCH wiki: http://wiki.freeswitch.org/wiki/PBXMate-FreeSWITCH-integration
Valer

From: bawajan <shaik.bawajan@gmail.com>
To: freeswitch-users@lists.freeswitch.org
Sent: Thursday, May 10, 2012 5:02 PM
Subject: Re: [Freeswitch-users] Choopy one-way noise

Hi Moises Silva,

am new to freeswitch and am facing same noise issue when making call from
ISDN (freetdm) to SIP UA.

As per above mail, i have did ftdm trace and listen the clips.  I found same
noise in generated voice clip of line 2 (sip).

am attached both audio files for your reference (ISDN line 1 and SIP line
2).

Kindly let me know, what needs to do to rectify it.
http://freeswitch-users.2379917.n2.nabble.com/file/n7546814/isdn_line1-in-s2c1.wav
isdn_line1-in-s2c1.wav
http://freeswitch-users.2379917.n2.nabble.com/file/n7546814/sip_line2-out-s2c1.wav
sip_line2-out-s2c1.wav

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