Voice RTP not tagged in EF ?

ogor · ‎02-06-2009

Hello,

It seems that my IP Phones 7911 have their voice flow that are not tagged in EF but in DSCP 0, why ?

DSCP For Call Control CS3

DSCP For Configuration Default

DSCP For Services Default

How can I change this, I'm with a CCME.

thanks

Olivier

Nicholas Matthews · ‎02-06-2009

Where are your IP phones connected?

Is it a switch?

Does that switch have MLS qos enabled? Does the port the phone is connected to have 'mls qos trust dscp' or 'mls qos trust cos'?

-nick

ogor · ‎02-06-2009

no mls qos enabled I want to specify the IP Phone to tag the RTP in EF and the sig in AF31 but on the phone not on the routers.

Temporarely I have configure policy-map to identify with ACL my RTP and Sig trafic and to tag them but I prefer to do it internally on the IP Phone (7911)

calluknet · ‎02-08-2009

NM-16ESW with PPWR-DCARD-16ESW - I think this integrated switch enables mls qos by default. Default means that nothing is trusted so you do need to enable trusting as you suggest.

paolo bevilacqua · ‎02-06-2009

Which exact IOS and phone FW ?

ogor · ‎02-06-2009

Hi,

They are connected on a NM-16ESW with PPWR-DCARD-16ESW router card.

Please check the attahed files to see the 2 type of routers used.

Olivier

pemelend · ‎02-06-2009

Hi

The phones mark the packets by default, but you need to apply a mls command so the switch can trust the phone marking.

Add on the interface the

mls qos trust

You can see an example config on this link.

http://www.cisco.com/en/US/products/hw/modules/ps2797/products_configuration_example09186a00808066b8.shtml#step4

Regards

Pedro

calluknet · ‎02-08-2009

How is the access layer switch configured? Are the phones directly connected to your lan? What type of switch/line cards are you using?

Worst case scenario can you use MQC to remark RTP?