Tagging voice trafic

[Peter Nugent]

This is simply out of interest and not an issue I am experiencing. Is there anywhere it explains or does anyone know how to tag voice trafic from a laptop, ie a softphone.

With seperate devices its easy, also I would not want to tag all traffic from a laptop or allow it onto a voice WLAN just because of the softphone so how would we deploy this and maintain the QoS profile over the WLAN and the rest of the network.

Just a theoretical question.

[Nicolas Darchis]

You can make a class map on a switch where you would tag traffic with QoS marking if it matches a certain access list. You could then restrict to the skinny control protocol port but for voice data packets, you'd need to mention a udp range unfortunately ...

There might be more precise ways but I don't know them

[George Stefanick]

You know ... if there was a program that would allow you to easily TAG taffic from a laptop I'd paid for it !

[weterry]

I'm in no way a QOS expert..... and I've not actually looked into this.... but I've seen plenty of Windows Mobile Devices that send packets at different priorities over the air based on the application in use. For example, a specific softphone that I know of I've seen send all voice packets at Priority 6 and the control stuff at Priority 3.....    If Windows Mobile allows it, I sure hope the big boy can do it too

My network cards in Windows XP show the component: "QoS Packet Scheduler", and if I understand correctly, as long as the application is written correctly then it can set the priority.....  But I suppose setting a QOS tag in the packet, may still not translate to the 802.11 qos/wmm priority which I assume is what you are actually trying to set.....

I've definitely never come across a "do it yourself" priority mapper though..

This is just a shot in the dark, but your softphone might already be doing it if you haven't actually looked.......

[weterry]

Might want to just ignore my last thought though... its late and I don't have a clue what I'm talking about.

[weterry]

See... this is what happens when I give up too soon. This is my last message, I swear (for now).

According to this article: http://blogs.msdn.com/b/wndp/archive/2006/06/30/653047.aspx

It actually sounds like Windows Vista and higher has a spiffy GPO policy for QOS tagging based on application name....

So if this is true, you could easily make a policy that sets priority:X for application: softphone.exe

[Peter Nugent]

I really do not know enough about engineering and manipulating QoS

.

However if I intend t achieve my goals I need to and this looks excellent, if a little complicated.

I guess I will have to get it working and do tons of packet sniffing to see the behaviours where a packet traverses a QoS threshold, if thats the phrase ie from laptop to ap to WLC and see what QoS parameters are preserved and manipulated.