QOS

[dstjames]

I just setup our first IP phone in a remote location (all of our other phones are digital). They say that they are getting an echo when they talk. I assume this is a latency issue with them being remote since I have 1 IP phone locally and it works fine. I want to setup QoS on my cisco firewalls since they connect through a VPN tunnel to us. I dont know exactly how to go about this. I understand I have to create a class map that matches a DSCP value (not sure what value) and then configure a policy map to give it priority and then apply that to an interface.

Has anyone ever done this before and can tell me exactly what the DSCP values should be? I looked in the gatekeeper tab on the manager and it has a DSCP (hex and decimal), DSCP Mask (hex and decimal) and a sig DSCP (hex and decimal)

 

[PlatinumGuy]

They are the values you want.

The IPO will tag all voip packets with diffserve headers containing those values.

All of your intermediate routers and layer three devices need to be configured to recognise those diffserve values.

ACA - IP Office Implement
ACS - IP Office Implement
ACE - IP Office Implement
ACI - IP Office Implement

 

[dstjames]

So I will create 3 different class maps matching the 3 DSCP values?

Do you know if I use the hex, decimal or doesnt it matter?

Also do you think this will help with the echo?

Thanks for the help

 

[Morrack]

If your cisco gear can support it, look into cisco's autoqos feature. Makes life a lot easier.



Peter Sherwood
Morrack Consulting
Affordable World Class Off-site Backup!

http://www.morrack.com