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Community Member

de-jitter buffer in VIC cards

We have two 1750-4V routers with 4 E&M ports (two VIC) each to do LAN to LAN and VoIP between two PBX .

The routers are connected by a 128kbps leased line.

The routers are running IOS 12.0(5)XQ.

The VoIP quality was good for two years untill we had a VIC failure (the router does not still see it and bot leds stay on red lights)

We changed the VIC but the bad voice quality persists.

Sometimes the voice calls result with a lot of drops like if there are jitter problems.

We tried increasing the voip bandwidth an reducing the fragment delay but without results even without data pachets travelling on leased line.

Ios 12.0(5)XQ on 1750 does not have commands to control play-out delay jitter buffer.

After a lot of tests we changed the second VIC on the same router that had the firts failure and the problem disappear.

The router does not show "anything we know" about a failure.

Is there a way to have a log about a HW failure of that kind ?

De-jitter buffers are on board of VIC E&M cards ?

2 REPLIES
Bronze

Re: de-jitter buffer in VIC cards

I'm fairly certain that the de-jitter buffers are in the memory of the IOS not the card itself. With that being said, couple of thoughts, 12.0.5 is a fairly old version of code from a voice standpoint. You could have gotten a VIC that has new firmware or perhaps a different component or two that could have given you the results. As far as troubleshooting a "show call active voice" when an active call was going on might have shown you something.

Rick

Community Member

Re: de-jitter buffer in VIC cards

Hi Rick

I send two samples of "show call active voice" during two voip conversations, each sample for both sides of the conversation.

For both samples the routers configurations were always the same and there was no data traffic on the leased line, just voip.

The first is for the old E&M VIC and the voip quality was bad.

The second is for the new E&M VIC and the voip quality was good.

If you can see something wrong in that outputs or something that could show a failure, that could be helpfull, I will appreciate.

Thanks, best regards

FIRST SAMPLE (BAD)

arz1750voip#sh call active voice

GENERIC:

SetupTime=14563490 ms

Index=1

PeerAddress=+32...

PeerSubAddress=

PeerId=32

PeerIfIndex=8

LogicalIfIndex=6

ConnectTime=14564659

CallState=4

CallOrigin=2

ChargedUnits=0

InfoType=2

TransmitPackets=435

TransmitBytes=-19404

ReceivePackets=2342

ReceiveBytes=74944

TELE:

ConnectionId=[0xB0599CD2 0x65C00107 0x0 0x8AE3654]

TxDuration=46930 ms

VoiceTxDuration=46840 ms

CoderTypeRate=g729r8

NoiseLevel=-11

ACOMLevel=20

OutSignalLevel=-70

InSignalLevel=-13

InfoActivity=2

ERLLevel=20

SessionTarget=

ImgPages=0

GENERIC:

SetupTime=14563490 ms

Index=2

PeerAddress=+22

PeerSubAddress=

PeerId=22

PeerIfIndex=10

LogicalIfIndex=0

ConnectTime=14564659

CallState=4

CallOrigin=1

ChargedUnits=0

InfoType=2

TransmitPackets=2391

TransmitBytes=47820

ReceivePackets=435

ReceiveBytes=8700

VOIP:

ConnectionId[0xB0599CD2 0x65C00107 0x0 0x8AE3654]

RemoteIPAddress=192.168.3.2

RemoteUDPPort=16424

RoundTripDelay=37 ms

SelectedQoS=best-effort

tx_DtmfRelay=inband-voice

SessionProtocol=cisco

SessionTarget=ipv4:192.168.3.2

OnTimeRvPlayout=8690

GapFillWithSilence=0 ms

GapFillWithPrediction=0 ms

GapFillWithInterpolation=0 ms

GapFillWithRedundancy=0 ms

HiWaterPlayoutDelay=70 ms

LoWaterPlayoutDelay=30 ms

ReceiveDelay=30 ms

LostPackets=0 ms

EarlyPackets=1 ms

LatePackets=0 ms

VAD = enabled

CoderTypeRate=g729r8

CodecBytes=20

SignalingType=cas

arz1750voip#

arz1750voip#

++++++++++++

vr1750voip#sh call active voice

GENERIC:

SetupTime=14565168 ms

Index=1

PeerAddress=

PeerSubAddress=

PeerId=0

PeerIfIndex=0

LogicalIfIndex=0

ConnectTime=14566329

CallState=4

CallOrigin=2

ChargedUnits=0

InfoType=2

TransmitPackets=597

TransmitBytes=11940

ReceivePackets=3955

ReceiveBytes=79100

VOIP:

ConnectionId[0xB0599CD2 0x65C00107 0x0 0x8AE3654]

RemoteIPAddress=192.168.3.1

RemoteUDPPort=16542

RoundTripDelay=38 ms

SelectedQoS=best-effort

tx_DtmfRelay=inband-voice

SessionProtocol=cisco

SessionTarget=

OnTimeRvPlayout=74540

GapFillWithSilence=0 ms

GapFillWithPrediction=0 ms

GapFillWithInterpolation=0 ms

GapFillWithRedundancy=0 ms

HiWaterPlayoutDelay=70 ms

LoWaterPlayoutDelay=37 ms

ReceiveDelay=37 ms

LostPackets=0 ms

EarlyPackets=1 ms

LatePackets=0 ms

VAD = enabled

CoderTypeRate=g729r8

CodecBytes=20

SignalingType=ext-signal

GENERIC:

SetupTime=14565169 ms

Index=1

PeerAddress=+22

PeerSubAddress=

PeerId=22

PeerIfIndex=10

LogicalIfIndex=6

ConnectTime=14566329

CallState=4

CallOrigin=1

ChargedUnits=0

InfoType=2

TransmitPackets=4008

TransmitBytes=72720

ReceivePackets=620

ReceiveBytes=19840

TELE:

ConnectionId=[0xB0599CD2 0x65C00107 0x0 0x8AE3654]

TxDuration=80510 ms

VoiceTxDuration=12400 ms

CoderTypeRate=g729r8

NoiseLevel=-65

ACOMLevel=12

OutSignalLevel=-27

InSignalLevel=-50

InfoActivity=2

ERLLevel=23

SessionTarget=

ImgPages=0

vr1750voip#

vr1750voip#

SECOND SAMPLE (GOOD)

arz1750voip#sh call active voice

GENERIC:

SetupTime=32181 ms

Index=1

PeerAddress=+32...

PeerSubAddress=

PeerId=32

PeerIfIndex=8

LogicalIfIndex=6

ConnectTime=32650

CallState=4

CallOrigin=2

ChargedUnits=0

InfoType=2

TransmitPackets=854

TransmitBytes=-11396

ReceivePackets=2373

ReceiveBytes=75936

TELE:

ConnectionId=[0x782A7483 0xF61F0007 0x0 0x4E918]

TxDuration=74540 ms

VoiceTxDuration=47460 ms

CoderTypeRate=g729r8

NoiseLevel=-56

ACOMLevel=0

OutSignalLevel=-71

InSignalLevel=-56

InfoActivity=2

ERLLevel=17

SessionTarget=

ImgPages=0

GENERIC:

SetupTime=32182 ms

Index=1

PeerAddress=+22

PeerSubAddress=

PeerId=22

PeerIfIndex=10

LogicalIfIndex=0

ConnectTime=32650

CallState=4

CallOrigin=1

ChargedUnits=0

InfoType=2

TransmitPackets=2373

TransmitBytes=47460

ReceivePackets=854

ReceiveBytes=17080

VOIP:

ConnectionId[0x782A7483 0xF61F0007 0x0 0x4E918]

RemoteIPAddress=192.168.3.2

RemoteUDPPort=16554

RoundTripDelay=35 ms

SelectedQoS=best-effort

tx_DtmfRelay=inband-voice

SessionProtocol=cisco

SessionTarget=ipv4:192.168.3.2

OnTimeRvPlayout=17070

GapFillWithSilence=0 ms

GapFillWithPrediction=0 ms

GapFillWithInterpolation=0 ms

GapFillWithRedundancy=0 ms

HiWaterPlayoutDelay=70 ms

LoWaterPlayoutDelay=30 ms

ReceiveDelay=30 ms

LostPackets=0 ms

EarlyPackets=1 ms

LatePackets=0 ms

VAD = enabled

CoderTypeRate=g729r8

CodecBytes=20

SignalingType=cas

arz1750voip#

+++++++++++++

vr1750voip#sh call active voice

GENERIC:

SetupTime=14847406 ms

Index=1

PeerAddress=

PeerSubAddress=

PeerId=0

PeerIfIndex=0

LogicalIfIndex=0

ConnectTime=14847867

CallState=4

CallOrigin=2

ChargedUnits=0

InfoType=2

TransmitPackets=937

TransmitBytes=18740

ReceivePackets=2701

ReceiveBytes=54020

VOIP:

ConnectionId[0x782A7483 0xF61F0007 0x0 0x4E918]

RemoteIPAddress=192.168.3.1

RemoteUDPPort=16578

RoundTripDelay=39 ms

SelectedQoS=best-effort

tx_DtmfRelay=inband-voice

SessionProtocol=cisco

SessionTarget=

OnTimeRvPlayout=51960

GapFillWithSilence=0 ms

GapFillWithPrediction=0 ms

GapFillWithInterpolation=0 ms

GapFillWithRedundancy=0 ms

HiWaterPlayoutDelay=70 ms

LoWaterPlayoutDelay=30 ms

ReceiveDelay=30 ms

LostPackets=0 ms

EarlyPackets=1 ms

LatePackets=0 ms

VAD = enabled

CoderTypeRate=g729r8

CodecBytes=20

SignalingType=ext-signal

GENERIC:

SetupTime=14847407 ms

Index=1

PeerAddress=+22

PeerSubAddress=

PeerId=22

PeerIfIndex=10

LogicalIfIndex=6

ConnectTime=14847867

CallState=4

CallOrigin=1

ChargedUnits=0

InfoType=2

TransmitPackets=2749

TransmitBytes=43460

ReceivePackets=960

ReceiveBytes=30720

TELE:

ConnectionId=[0x782A7483 0xF61F0007 0x0 0x4E918]

TxDuration=104820 ms

VoiceTxDuration=19200 ms

CoderTypeRate=g729r8

NoiseLevel=-60

ACOMLevel=4

OutSignalLevel=-42

InSignalLevel=-58

InfoActivity=2

ERLLevel=18

SessionTarget=

ImgPages=0

vr1750voip#

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