Voice RTP not tagged in EF ?

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Feb 6th, 2009
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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.



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Nicholas Matthews Fri, 02/06/2009 - 07:28
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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'?


ogor Fri, 02/06/2009 - 07:38
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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 Sun, 02/08/2009 - 13:15
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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 Fri, 02/06/2009 - 07:30
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Which exact IOS and phone FW ?

ogor Fri, 02/06/2009 - 07:36
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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.


calluknet Sun, 02/08/2009 - 13:12
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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?


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