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VOIP QOS deployment

Posted on 2008-06-26
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Last Modified: 2013-12-27
I am new to QOS so please bear with me.
This is a very basic sketch of my network.

                                   (Site-2-Site VPNs)
Multiple remote sites ------> WAN  <------ 2800 <-----ASA 5510 <----- 2960(G) ---[ LAN with BCM400.

I have started using VOIP between some locations but I am concerned about the implications of not having QOS network wide.
    1. Should I configure QOS on every device (2800, ASA 2960(G) switches etc)?
    2. 20 Remote sites will each have a max of 2 IP/Softphone (Nortel & Cisco) and has 1mb down and    atleast 256kbps upload speeds how would you recommend we allocate bandwidth for VOIP?
       N.B codec: cisco g729 and nortel g711.
If i am missing anything please help!


If I have to configured QOS on each device  
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Question by:coolcorp
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by:grblades
ID: 21881735
You should configure QOS on all devices that directly connect to the WAN.
QOS is used to decide what packets to drop on a congested line so you only need to configure it on equipment which sits between a high and a lower bandwidth connection.

You should also configure it on the switches if they have the capability. How important this is depends on whether the phones have their own dedicated network port or whether computers daisy chain off the back of the phone. Also if you have servers with gigabit network connections this has an effect aswell.

You will also need to enquire with the WAN provider to make sure the WAN itself supports QOS.
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by:coolcorp
ID: 21900302
Thanks grblades,
I have a few phones that are daisy chained and Data and VOICE share the same network.
Yes we have servers with gigabit connections as well.
How drastic do think this will be and what approach you think i should take?
Also there may be an issue creating a seperate network for VOICE.
I am also thinking that if the phones are going to be daisy chained then data and voice will have to be on the same network?
Please guide me?
Thanks.
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grblades earned 500 total points
ID: 21900909
No you can still have the phones on a different VLAN even if the computers are daisy chained off the back of them. You just set the switch to enable 802.1q trunking and set the voice VLAN number to be permitted over the trunk. Then on the phones you configure them to perform VLAN tagging. Then all voice traffic is sent over the VLAN while normal data is untagged and so goes over the default VLAN the port on the switch is configured to use.
You certenly dont have to keep voice and data separate in this fashion. Often people use voip clients on their pc's or have some management panel running on their pc so the networks have to be combined and often it is easier to run it all over a single network anyway.

I would setup a test. Get a phone and daisy chain a pc off the back of it. Make a call and then try and copy a very large file to and from the pc and see if you can hear anything during the phone call. If possible try it will a ftp file transfer to the server with a gigabit network connection as this will be worst case. Windows file sharing is far less efficient than ftp so if ftp does not cause a problem copying a file in windows shouldnt either.

Configuring a switch to use QOS is normally fairly easy. It really easy if you dedicate a VLAN for voice as cisco switches have a preset configuration for this that you practically just need to turn on.
If you are sharing the voice and data you need to configure the switch to trust the difserv/tos (QOS indication flags in the packet headers) that the phones set automatically so it doesnt really make much difference.
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