[cisco-voip] Troubleshooting echo T1 CAS E&M

[Jose Robles]

We have a 2811 router with a T1 CAS E&M wink to the PSTN. People are
complaining they hear echo when they make a call(they hear themselves).
I played with the echo-cancel coverage command, the echo suppressor and
the echo-cancel erl worst-case commands using all existing and
imaginable values. I've read of the thl tone sweep tool to calculate the
impedance setting in the line but this tool doesn't work with T1. Ill
need a hardware for echo cancellation? I'm sending part of a show call
active voice:

 

 

GENERIC:

SetupTime=1543321430 ms

Index=1

PeerAddress=17878611407

PeerSubAddress=

PeerId=1

PeerIfIndex=36

LogicalIfIndex=35

ConnectTime=1543334890 ms

CallDuration=00:01:11 sec

CallState=4

CallOrigin=1

ChargedUnits=0

InfoType=speech

TransmitPackets=4124

TransmitBytes=692832

ReceivePackets=4268

ReceiveBytes=682880

TELE:

ConnectionId=[0x61053E4A 0x8EA011DA 0xA5E79004 0x1FF0B5C6]

IncomingConnectionId=[0x61053E4A 0x8EA011DA 0xA5E79004 0x1FF0B5C6]

CallID=24620

TxDuration=85350 ms

VoiceTxDuration=85350 ms

FaxTxDuration=0 ms

CoderTypeRate=g711ulaw

NoiseLevel=-40

ACOMLevel=15

OutSignalLevel=-67

InSignalLevel=-6

InfoActivity=1

ERLLevel=15

EchoCancellerMaxReflector=9

SessionTarget=

ImgPages=0

CallerName=

CallerIDBlocked=False

OriginalCallingNumber=

OriginalCallingOctet=0x0

OriginalCalledNumber=

OriginalCalledOctet=0x0

OriginalRedirectCalledNumber=

OriginalRedirectCalledOctet=0x0

TranslatedCallingNumber=

TranslatedCallingOctet=0x0

TranslatedCalledNumber=17878611407

TranslatedCalledOctet=0x0

TranslatedRedirectCalledNumber=

TranslatedRedirectCalledOctet=0x0

GwOutpulsedCalledNumber=17878611407

GwOutpulsedCalledOctet3=0x0

DSPIdentifier=0/1:1

 

 

 

 

 

 

Jose A. Robles
Sr. Network Consultant
CCNP, CCDP
CQS Routing and Lan Switching Specialist
Netxar Technologies, Inc. - www.netxar.com 
17 Ponce Street 
San Juan, PR 00917
ph:  +1 787 765 0058  x2015
fax: +1 787 756 5362 
cel: +1 787 547-0149
email jose.robles at netxar.com

 

 

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