This document describes how to troubleshoot and eliminate echo where possible in IP Telephony networks with DINSTAR FXO gateways.

PSTN Phone User Hears Echo

The solution is to adjust IP to PSTN Gain value.

IP side User Hears Echo

The solution is to adjust PSTN to IP Gain value.

Troubleshoot echo problem with firmware version higher than 20.01.07

Create a telnet session to access the FXO gateway, to adjust Gain value as following steps:

telnet 192.168.1.100

Welcome to Command Shell!

Username:admin

Password:******

ROS^en

ROS#dsp  ( If GSM Gateway , Here is Command “eia” )

note: you can input <quit> to quit

———————————————–

——————-Normal set——————-

———————————————–

code type: 0~3 (723_6/729A/711A/711U)

value = 1 :leave here blank ,and type “Enter” key if u do not need change .

PCM <- NET Port volume gain: (-32~32), default:0

value = 0 : here type ” -8″ , then “ENTER” key if u need to change to “-8″

If u get echo in the PSTN side , decrease this value , -8 is recommendation

PCM -> NET Port volume gain: (-32~32), default:0

value = 0 :

If u get echo in the IP side , decrease this value , -8 is recommendation

FXO CODEC <- PHONE gain: 0 ~ 5 (0 ~ 5 db), default:1

value = 1 :

If u get low volume in the PSTN side , increase this value

FXO CODEC -> PHONE  gain: 0 ~ 5 (0 ~ 5 db), default:2

value = 2 :

If u get low volume in the IP side , increase this value

FXS CODEC <-PHONE   gain: 0 ~ 2 (0: 0db; 1: -3.5db;2: +3.5db), default:0

value = 0 :

FXS CODEC -> PHONE  gain: 0 ~ 2 (0: 0db; 1: -3.5db;2: +3.5db), default:0

value = 0 :

Port SCE flag: (0, 1), default:1

value = 0 :

busytone threshold:  -20~-35 (if 0, use default value)

value = 0 :

busytone hangover:  5ms~32767ms (if 0, use default value)

value = 0 :

busytone tone_on_frac:  1~32767 (if 0, use default value)

value = 0 :

busytone lo_cutoff_freq:  200hz~3000hz (if 0, use default value 300hz)

value = 300 :

busytone hi_cutoff_freq:  200hz~3000hz (if 0, use default value 550hz)

value = 700 :

busytone DeltaMs:  30ms~1000ms (Default 50ms)

value = 50 :

dtmf volume:  (-32 ~ 32), (default: 0)

value = 0 :

dtmf internal: (80~200), (default: 200ms)

value = 80 :

set Fxo Offhook wait time : 0 – 1 (0: 4S; 1: 1S) (default: 0)

value = 0 :

Set Fxo Hint Voice for Dialtone?   0 – 1 (0: No; 1: Yes) (default: 0)

value = 0 :

Set Fxo detect cid sended before clash royale free gems no human verification ring?   0 – 1 (0: No; 1: Yes) (default: 0)

value = 0 :

IpPhone AutoDialer enable: 0 – 1 (default: 0/Disable)

value = 0 :

fax max rate:  2400,4800,7200,9600,12000,14400(unit:bps)(default : 14400)

value = 9600 :

fax volume:  (-9 ~ 9)(default: 0)

value = 0 :

fax pkt send internal:   (10 ~ 80), (default : 10ms)

value = 10 :

Set fax mode ?   0 – 1 (0: T38; 1: T30) (default: 0)

value = 0 :

set cptone type: 0-USA TYPE, …(0~21)

cptone type = 17 :

set FXS param: 0-USA TYPE, …(0~21)

FXS param = 17 :

set FXO param: 0-USA TYPE, …(0~15)

…3-Germany TYPE,3-New Zealand and India TYPE, 5-England TYPE, 15-global impedence

This is used for modify the impedance , Input “5″and enter key t modify the impedance to England Type.If you are the other type,please input the number as below:

number Type or impedence value
0 600
1 900
2 270+(750||150nF)(TBR21) and 275+ (780||150nF)
3 220+(820||120nF)(New Zealand/Australia) and 220+ (820||115nF)(Slovakia/South Africa/Germany/Austria/Bulgaria)
4 370+(620||310nF)(New Zealand #2/India)
5 320+(1050||230nF)(England)
6 370+(820||110nF)
7 275+(780||115nF)
8 120+(820||110nF)
9 350+(1000||210nF)
10 0+(900||30nF)
11 600+2.16uF
12 900+1uF
13 900+2.16uF
14 600+1uF
15 Global impedance

fxo ac param type= 0 :

set caller id mode: 0-USA TYPE, …(0~21)

caller id mode = 0 :

send rtp keepalive: 0-do not send, 1-send

value = 0 :

…………..

( leave here blank ,and type “Enter” key  until  you see the below )

Then reboot the gateway

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