From: Roman Rodichev (roman@iementor.com)
Date: Wed Apr 25 2007 - 19:07:03 ART
Sirus,
a lot of people ask this question, what is the point of voice QoS on internet links. Your concern is valid. The question I'd have to ask is where does voice traffic travel. Is it site-to-site vpn+voip, is it a managed service with your service provider? Is there other traffic other than voice using this link? Your internet link at the central site and internet link at the remote site are usually the only bottlenecks in the entire path that voip traffic has to travel through. It doesn't hurt to prioritize voice traffic on them to make sure voice traffic receives better treatment than other data traffic going out to the internet.
Of course, you don't have the same control from the ISP router's side, but a lot of ISP's out there will configure DSCP-based priotarization for you if you ask them and pay the fee.
Lack of priotarization inside ISP networks is *usually* not too big of a deal, because their pipes are much larger.
In any case, I've setup and managed several large customers with VoIP running across VPN links between sites, and 99% of the time voice quality is pretty good. It's all about the latency :)
Regards
---------------------
Roman Rodichev
5xCCIE #7927 (R&S, Security, Voice, Storage, Service Provider)
Instructor, Content Developer. ieMentor Corporation.
roman@iementor.com
http://www.iementor.com
> -------Original Message-------
> From: sirus MOGHADASIAN <cyrus.mgh@gmail.com>
> Subject: confusing QOS question
> Sent: Apr 25 '07 15:10
>
> I really frustrated with this QOS problem.
>
>
> Assume company that run VOIP connected to ISP for accessing to the
> internet.
> If this company run QOS on its edge router to prioritize voice traffic,
> there is no change occur to incoming voice traffic since service provider
> not run QOS and company's voice traffic must first come to service provider
> routers then come to company's edge router.
>
> Routers implement QOS on their outgoing interface (assume we implement QOS
> on edge router interface that forward traffic into company and ISP not run
> QOS so traffic come across ISP router without prioritizing and running QOS
> on our router not help us)
>
> So if ISP not run QOS on its router , implementing QOS on edge router is
> useless and we can't prioritize our traffic without help of ISP.
>
> SO what's the point to implement QOS for this company?
>
> Thanks
> Sirus Moghadasian
>
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