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Where to set up QoS "ef" tagging?

Hi Experts,

We have our ISP set up QoS using DSCP "ef" for tagging site-to-site VOIP in order to prevent choppy voice qty. But we still got the issue intermittently. While further investigating, the ISP found there is no voice traffice with a tag 'ef' flowing so they want us to set up the 'ef' tagging in the phone system. But our phone system provider doesn't know how to. That makes us think maybe it should not be the phone system where to set up the tag. In our LAN we have an IAD which is ISP's property and is not accessible to us. Other than that are Cisco ASA, Switches, etc. None of them is configured with QoS.

So the question comes down to be: where to set up traffic tagging so the ISP's QoS can identify the "ef" tagging and prioritize it?
Please help.

mat1458

You can do it on the Cisco switch. What type of switches in what kind of architecture do you have (if you have please add sketch of your network)? If we know the type we might give you a hint on how to do it. You might want to try out auto-qos if it exists in your Cisco IOS version.

What type of phone system/phones do you have? Possibly it can be done there as well.

Castlewood

ASKER

We finally used Wireshark to see that the phone system actually does 'ef' tagging on the voice traffic while received by the switch (HP v1810) but the tag is stripped by the switch while transmitted. So the question comes down to be, how to set up the HP V1810 switch not to change the packet?
Please help.

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mat1458

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Castlewood

ASKER

We ended up using the IP address for QoS criteria. It works.
Thanks.

Where to set up QoS &quot;ef&quot; tagging?

Where to set up QoS "ef" tagging?