RE: Re: Are you interested in VoIP ?

["Dean Smith" <ukha@xxxxxxx>]

To be meaningful any QoS policy has to be controlled and implemented end to
end. Which is the key problem for the Internet - how do you get thousands
of
ISPs to agree a common QoS policy and if you did, doubtless someone would
sell its best QoS to everyone - rendering it meaningless. For some packets
to have priority - some have to be held back.

I have heard real stories of customers asking for QoS to be implemented on
private Intranets  - so that they can have their mail traffic get priority
over browsing  - neatly demonstrating that one mans idea of whats high
priority packetwise isn't everybody's !

Implementing some local queuing/prioritisation strategies may make a
difference to the affect local congestion on an access link has but its not
an end-to-end QoS solution. Most of the examples of commercial VoIP I've
seen have tended towards the "make sure there's always more than
enough
bandwidth + a bit more" school of QoS implementation ;-)

Dean
-----Original Message-----
From: K. C. Li [mailto:li@xxxxxxx]
Sent: 11 March 2003 18:26
To: ukha_d@xxxxxxx
Subject: RE: [ukha_d] Re: Are you interested in VoIP ?


On Tue, 11 Mar 2003, Keith Doxey wrote:

> drops. To counter this additional information is added to the packets
and
> the routers prioritise this traffic to guarantee Quality Of Service
(QOS).

As far as I know, most commercial VoIP services don't have QoS guarantees.
For example, the BT VoIP service NetChat and the earlier SurfTalk don't
have any service or quality guarantees. I might be out of touch with VoIP
as the information was from over a year ago.

Regards,

Kwong Li
li@xxxxxxx
Laser Business Systems Ltd.
http://www.laser.com


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