Good Router to Split up speed for VOIP

I am curious to know if there is a good router to split up the speed of my internet connection so I can route the majority of my speed over to the VOIP for the best possible quality.

Also, what if I wanted to add a line at my business to do the same thing.  Would you use the same router?  We currently have two 24 port switches and use Bellsouth DSL 6.0.  DHCP and DNS is handled by our win2k3 server.

Thanks for your help.
joemckameyGeneral ManagerAsked:
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Reserving bandwidth or prioritising traffic for voice is not a common feature on home routers. You best bet would be to have a look at the Zyxel range. They only cost a little more than the likes of Netgear, Linksys etc... but have the bandwidth reservation features.

The Zyxel is a business call router so may be suitable all depending on the speed of your internet connection at work.

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Edgewater is currently the leader for VoIP QOS.  Adtran has a new product out but, it it using a new form of multilayer TOS.  I would definately look at the edgewater, they have a very stable and proven product.
That is for your business.... sorry... at home.. I use the dlink dl-102 (69.95 at compusa) works fine for less than 2 concurrent calls.
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Difficult to answer without knowing a bit more about your abilities and your service provider ...

There are two directions to consider - outbound you have direct control over, but inbound QoS requires action by your service provider to configure their router. Outbound QoS or traffic shaping is a facility of many routers/firewalls once you get out of the budget home user territory, inbound is out of your control unless you ISP happens to do it already (there are a few).

If you have the ability, or the ability to learn, or know someone who can do it for you, then I suggest you look at the Advanced Linux Routing & Traffic Control Howto ( - it has a section on how to use the traffic shaping abilities in Linux to control both the outbound, and to a large degree the inbound as well, traffic. It manages the inbound traffic by throttling the outgoing packets in the traffic streams - so it can keep the average inbound rate just below the actual line capacity, prevent the ISP router from filling a large buffer, and thus give the best response. It's never gooing to be as good as a QoS setup on the upstream end, but it's probably as good as you'll get.
I have a feeling he is not at that level though FurnessSupport... For residentual there is abundance of downstream... so just prioritizing at the gateway will work with less than two calls (this is how vonage and att and all the others getaway without a QOS device).  As far as offices where they often have symetric speeds you need to start worrying about inbound traffic.

The VoIP standard that has been first implemented by Cisco (than edgewater, adtran, eu4oria and so on) is the packet acknowledgement delay... TCP traffic will not send a new packet till it recieves an ack packet on the prior one so... this is the method implemented in these devices... As far as calling your ISP and asking about QOS? They will nt have it unless they are running a managed VoIP network behind it... also... if they are not a tier one carrier you are at the will of the cloud... as always...

This is the world we live in... imperfect calls... but, there are many simple devices out there for the avg user...

VoIP Engineer's blessing:  May your MOS score never drop below 4 and all your calls be jitter free.

Also for joemckamey... QOS means Quality of service... you are not "spliting your interent" you are prioritizing voice traffic over data traffic... this allows for dynamic shaping and less wasted bandwidth....
most likely true end to end QOS is not possible as your network equipment and your ISP and VoIP provider would have to have full layer 3 QOS tagging to get it working successfully. However i have got it working reliably using Traffic Rate Limiting and Policing using Cisco Routers, i have got this working reliably using a Cisco 837 and 2600 router on two of my sites, and for testing i have saturated my link using bittorrent and i am still able to make VoIP calls.

I know that cisco is the only way to go unless you have true end to end QOS provided by your ISP and VoIP provider which is very unlikely
joemckameyGeneral ManagerAuthor Commented:
that would be fine with me...
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