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NEC VoIP phones

I have several NEC DT700 series ITL-8LD-1 VoIP phones and I have the following questions:
- what is the codec used by this model?
- Do I configure my Cisco switch with "mlqs os trust dscp" or "mls qos trust cos" on the interface?

Thanks

ASKER CERTIFIED SOLUTION

Norm Dickinson

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SOLUTION

JRSCGI

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leblanc

ASKER

Does the DT700 phone mark the packet as dscp or cos? Thx

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JRSCGI

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leblanc

ASKER

For the G.711, G.729A, G.722, you just configure on the phone. Correct?

Sorry I'm not a voice guy. Thx

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JRSCGI

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Ruel Tmeizeh

Which model switch? If it is a 2950 SI, you may need to use mls qos trust cos pass-through dscp, since that model does not handle the rewriting of CoS to DSCP correctly (or I should say in the standard way).
QoS is a fairly complex subject, so some reading on the subject is probably in order :-)

Don't forget that after setting your switch to trust either DSCP markings, CoS tags, or both, you also need to set the queue settings on the switch to process the higher priority frames/packets first. Merely setting the switch to trust the markings doesn't necessarily do anything on it's own; it is the queue settings that allow the actual processing to prefer the marked packets.

leblanc

ASKER

I am using auto QoS. It generates all the queuing for you. Thx

Ruel Tmeizeh

Ok yes if u do the auto commands then it will setup the queues for you. Good luck with your setup :-D

leblanc

ASKER

Thanks.