[cisco-voip] 2801: VoIP -> PSTN Echo Problems

[Charles Ragan]

Hi Johan,

Could definitely be a dspware bug.

Do a sho voice dsp and check dspware version.  we ran into a lot of 
echo with 4.4.708.....we went to 4.4.18.  check with tac for 
appropriate upgrade procedures and versions for your hardware.

charles

At 12:31 PM 3/20/2007, Johan Bloemhard wrote:
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>I have been pulling my hair out concerning echo problems from 
>IP->PSTN calls.  I have been through the 
><http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a0080149a1f.shtml>http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a0080149a1f.shtml 
>website multiple times that Ryan has previously suggested reading.
>
>It is an intermittent problem so it's very hard to troubleshoot.  I 
>have a TAC case open but the TAC engineer is having me capture data 
>in the IP Port and the GW port (extremely difficult to do in a 
>production environment).  Also the TAC engineer hasn't asked for any 
>info on the 2801 (i.e., sh tech-support) or configs so it's my 
>belief that maybe it's being looked at from the wrong direction.
>
>I was able to get a call out and pull the "sh call active voice" for the call.
>
>IOS: Cisco IOS Software, 2801 Software (C2801-SPSERVICESK9-M), 
>Version 12.4(10), RELEASE SOFTWARE (fc1)
>
>My stats for the call are as below which obviously my echo 
>cancellation isn't being activated.  I find it hard to believe that 
>I can have an ACOMLevel of 0 but I'm not sure what could be causing this.
>NoiseLevel=-62
>ACOMLevel=0
>OutSignalLevel=-70
>InSignalLevel=-65
>InfoActivity=1
>ERLLevel=0
>EchoCancellerMaxReflector=19368
>
>My voice-port configuration is as follows:
>Cisco-2801#sh voice port 0/1/1
>
>Foreign Exchange Office 0/1/1 Slot is 0, Sub-unit is 1, Port is 1
>  Type of VoicePort is FXO
>  Operation State is DORMANT
>  Administrative State is UP
>  The Last Interface Down Failure Cause is Administrative Shutdown
>  Noise Regeneration is enabled
>  Non Linear Processing is enabled
>  Non Linear Mute is disabled
>  Non Linear Threshold is -21 dB
>  Music On Hold Threshold is Set to -38 dBm
>  In Gain is Set to -5 dB
>  Out Attenuation is Set to 5 dB
>  Echo Cancellation is enabled
>  Echo Cancellation NLP mute is disabled
>  Echo Cancellation NLP threshold is -21 dB
>  Echo Cancel Coverage is set to 64 ms
>  Echo Cancel worst case ERL is set to 6 dB
>  Playout-delay Mode is set to adaptive
>  Playout-delay Nominal is set to 60 ms
>  Playout-delay Maximum is set to 250 ms
>  Playout-delay Minimum mode is set to default, value 40 ms
>  Playout-delay Fax is set to 300 ms
>  Connection Mode is plar
>  Connection Number is 6331
>  Initial Time Out is set to 10 s
>  Interdigit Time Out is set to 2 s
>  Call Disconnect Time Out is set to 60 s
>  Ringing Time Out is set to 180 s
>  Wait Release Time Out is set to 30 s
>  Companding Type is u-law
>  Region Tone is set for US
>
>  Analog Info Follows:
>  Currently processing none
>  Maintenance Mode Set to None (not in mtc mode)
>  Number of signaling protocol errors are 0
>  Impedance is set to 600r Ohm
>  Station name None, Station number None
>
>  Caller ID Info Follows:
>  Standard BELLCORE
>  Caller ID is received after 1 ring(s)
>  Translation profile (Incoming):
>  Translation profile (Outgoing):
>
>  Voice card specific Info Follows:
>  Signal Type is loopStart
>  Battery-Reversal is enabled
>  Number Of Rings is set to 1
>  Supervisory Disconnect is signal
>  Answer Supervision is inactive
>  Hook Status is On Hook
>  Ring Detect Status is inactive
>  Ring Ground Status is inactive
>  Tip Ground Status is inactive
>  Dial Out Type is dtmf
>  Digit Duration Timing is set to 100 ms
>  InterDigit Duration Timing is set to 100 ms
>  Pulse Rate Timing is set to 10 pulses/second
>  InterDigit Pulse Duration Timing is set to 750 ms
>  Percent Break of Pulse is 60 percent
>  GuardOut timer is 2000 ms
>  Minimum ring duration timer is 125 ms
>  Hookflash-in Timing is set to 600 ms
>  Hookflash-out Timing is set to 500 ms
>  Supervisory Disconnnct Timing is set to 350 ms
>  OPX Ring Wait Timing is set to 6000 ms
>Cisco-2801#
>
>Thanks in advance,
>
>Johan Bloemhard
>Senior Information Technology Specialist
>___________________________________
>Silver Falls School District 4J
>802 Schlador Street
>Silverton, OR 97381
>w: 503.873.6331
>
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Charles B Ragan
CCIE 1764 (Voice/R-S)
336-442-4361
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