[Asterisk-Users] Adit 600 FXO card sound quality

[C F]

I have an adit 600 with one fxo card connected to a Digium single span T1 card.
CallerID, disconnect supervision work perfect, however the users
complain that they have some sound quality issues, after testing it I
realized that whenever one is in a phone call they get like silence
between the sounds coming from the other party, almost like a cell
phone, in other words if there is no sound coming from the other party
it sounds like they have hung up, which is very annoying.
The usres all use Polycom IP 501s connected to Asterisk which is
running a a TE110, here is the configs from the Adit:
-------------------------------------------------------------
-Adit 600 configuration file
-Created on 01/04/2002 at 14:26:40 for root
-This file is valid for the following configuration only:
-
-        CardType
-        --------
-SLOT A   T1x2         SW Version:  9.0.0
-SLOT 1   FXOx8
-SLOT 2   FXOx8
-SLOT 3   FXSx8
-SLOT 4   FXSx8
-SLOT 5   FXSx8
-SLOT 6   RTRx1
-NOTES:
-1. It is necessary to issue the commands 'restore defaults'
-   and 'reset' BEFORE downloading the configuration file to
-   ensure proper configuration.
-2. Lines beginning with '-' will be ignored as comments
-   by the CLI.  Before downloading, review the sections of
-   the configuration file delimited by these comments and
-   delete the commands that are not needed (e.g. 'set ip
-   address' and 'add user' are likely candidates for
-   deletion).
-3. While downloading, a character delay of 5 ms and a line
-   delay of 300 ms is recommended.
-------------------------------------------------------------

-Turning off verification messages.

set verification off

-Setting local off.

set local off

-Disconnecting all connections.

disconnect a
disconnect 1
disconnect 2
disconnect 3
disconnect 4
disconnect 5
disconnect 6

-Setting IP addresses.

set ethernet ip address 192.168.1.51 255.255.255.0
set ip gateway 192.168.1.1

-Setting the SNMP MIB-II System Group objects.

set snmp getcom "public"
set snmp setcom "public"
set snmp trapcom "public"
set snmp trapauth enable
set snmp trapevent all



-Setting slot a.

set a:1 up
set a:1 fdl none
set a:1 lbo 1
set a:1 framing esf
set a:1 id "toasterisk"
set a:1 linecode b8zs
set a:1 loopdetect csu
set a:1:1-24 side drop
set a:1:1-24 type voice
set a:1:1-24 signal ls
set a:2 down
set a:2 fdl none
set a:2 lbo 1
set a:2 framing esf
set a:2 id "CAC DS1# A:2"
set a:2 linecode b8zs
set a:2 loopdetect csu
set a:2:1-24 side drop
set a:2:1-24 type voice
set a:2:1-24 signal ls

-Setting slot 1.

set 1:1-8 signal lscpd
set 1:1-8 txgain -3
set 1:1-8 rxgain -6

-Setting slot 2.

set 2:1 signal lscpd
set 2:1 txgain -3
set 2:1 rxgain -6
set 2:2-8 signal ls
set 2:2-8 txgain -3
set 2:2-8 rxgain -6

-Setting slot 3.

set 3:1-8 signal ls
set 3:1-8 txgain -3
set 3:1-8 rxgain -6
set 3:1-8 linelength short

-Setting slot 4.

set 4:1-8 signal ls
set 4:1-8 txgain -3
set 4:1-8 rxgain -6
set 4:1-8 linelength short

-Setting slot 5.

set 5:1-8 signal ls
set 5:1-8 txgain -3
set 5:1-8 rxgain -6
set 5:1-8 linelength short

-Setting slot 6.

set 6 proxy disable

-Setting users.

add user "root"

-Setting network id.

set id "channelbank"

-Setting primary and secondary clock sources.

set clock1 a:1
set clock2 internal

-Making connections.

connect a:1:1-8 1:1-8

-Turning verification on.

set verification on

==================
If anybody got this working perfectly please let me know.
Thank You