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QoS for VoIP traffic!

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Hello,

how can i set a Quality of Service(QoS) policy to preserve the voip traffic on my docsis network?

I have a Motorola BSR2000 CMTS, Cable Modems Motorola SB4200, and for provisioning ISC DHCP, TFTP Server on Centos 5.2...

thanks in advanced...

We use something like this:

UsServiceFlow
{
UsServiceFlowRef 1;
QosParamSetType 7;
TrafficPriority 7;
MaxRateSustained 65536;
SchedulingType 2;
RequestOrTxPolicy 0x00000002;
}
UsServiceFlow
{
UsServiceFlowRef 3;
QosParamSetType 7;
TrafficPriority 7;
MaxRateSustained 75000;
MaxTrafficBurst 1522;
SchedulingType 2;
RequestOrTxPolicy 0x00000088;
}

DsServiceFlow
{
DsServiceFlowRef 101;
QosParamSetType 7;
TrafficPriority 1;
MaxTrafficBurst 16000;
MaxRateSustained 65536;
MaxDsLatency 30000;
}
DsServiceFlow
{
DsServiceFlowRef 103;
QosParamSetType 7;
TrafficPriority 7;
MaxRateSustained 75000;
MaxDsLatency 25000;
}

UsPacketClass
{
ServiceFlowRef 3;
ClassifierRef 16;
RulePriority 120;
ActivationState 1;
IpPacketClassifier
{
IpSrcAddr 10.250.0.0;
IpSrcMask 255.255.0.0;
}
}
DsPacketClass
{
ServiceFlowRef 103;
ClassifierRef 116;
RulePriority 120;
ActivationState 1;
IpPacketClassifier
{
IpDstAddr 10.250.0.0;
IpDstMask 255.255.0.0;
}
}

where, UsServiceFlowRef 1 and DsServiceFlowRef 101 are for Internet.
UsPacketClass and DsPacketClass whith UsServiceFlowRef 3 and DsServiceFlowRef 103 are for VoIP.
If you have any questions, write to me...

Hello,

thanks a lot.....but one more question... this applies to SIP traffic because a used to use an Ip Phones logged in a asterisk server through the cable modem...

thanks for your help....!

We're using this for MGCP, unfortunately I do not know how to behave for SIP traffic. I don't have a SIP modem to check it.

do you use a specific platform to provide voip service to your cable modems?, embedded MTA?, what models do you use?

thanks for all!!!

Yes, we use a dedicated platform based on asterisk. This is a Polish company manufacturing Adescom. http://www.adescom.pl/index.php?page=kontakt_eng They provide hardware, software and support.
What models do you use? What modem? Different modems, like: Arris (TM40xB, TM50xB, TM601B), Scientific Atlanta EPX2203 and Motorola SBV5121E. They all work seamlessly with our system. Please contact the Adescom, they will surely answer all your questions more accurately.
T.

at this time we use Motorola cable modems SBV4200 and SBV5220!!

docsis