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
read more and respond »Posted 5 years ago by John Rennie in Cisco Systems
