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7.4

VoIP QoS with DSL and Cisco 837

Asked by zhoffman in Voice Over IP

Tags: cisco, qos, voip, 837

Situation: Need to provide better QoS for VoIP calls between offices travelling over VPN connected by DSL.

Details: I have one main corporate office and two remote offices all currently connected via site-to-site VPN connections using Cisco 837 routers.  At our main site, we have a Tier 3 DSL connection with 1.5Mbps up and 768kbps down.  The two remote sites both have SDSL connections at 512kbps up and down.

We have a VoIP phone system with about 5 users at each of the remote offices and 10 users at the main office.  The calls work relatively well currently until someone starts some heavy download at the remote offices and the VoIP calls are stomped on.

What I need to know is, are there some better ways of providing QoS for the VoIP calls since they're travelling on a VPN through DSL connections?

Currently, I've tried using the priority queueing options (priority-list command) on the 837's for some of the VoIP ports.  The problem with this is that the particular VoIP phone system I'm using (Altigen), uses UDP ports around the 49000 range for the phones, and it can use any one of like 250 ports which is not very effective to add to the priority-list.

So, any thoughts would be greatly appreciated.  Thanks!  Please let me know if you need further details.
[+][-]08/29/04 08:32 AM, ID: 11925958Accepted Solution

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About this solution

Zone: Voice Over IP
Tags: cisco, qos, voip, 837
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Solution Provided By: rwotherspoon
Participating Experts: 4
Solution Grade: A
 
[+][-]07/24/04 01:27 AM, ID: 11627464Expert Comment

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[+][-]07/27/04 07:17 PM, ID: 11652796Expert Comment

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[+][-]07/29/04 02:08 PM, ID: 11671386Expert Comment

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[+][-]08/03/04 09:53 AM, ID: 11706886Expert Comment

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[+][-]08/18/04 02:35 PM, ID: 11836050Author Comment

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[+][-]08/30/04 03:10 PM, ID: 11936564Author Comment

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[+][-]01/21/05 10:00 AM, ID: 13105060Expert Comment

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