Does QOS on an 828 or 837 actually achieve anything?

We have a number of customers using VOIP through an ADSL to ADSL or SDSL to
SDSL VPN, and inevitably they occasionally get sound quality problems. Am I
right in thinking that implementing QOS on the 837 (ADSL) or 828 (SDSL)
routers isn't going to help?

My reasoning is:

- all the public Internet routers between the two sites will ignore any QOS
settings on packets I generate

- because it's a VPN the same public routers will just see ESP packets and
won't even get to see any VOIP settings made by the PBXs

If I understand correctly I can use QOS on the router to control how the
router prioritises packets sent from my LAN out through the ADSl or SDSL line.
However if the latency problems are due to the intervening public Internet
routers there is nothing I can do about it. Is this a reasonable summary?

Thanks,

John Rennie
.

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