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Topic # 14865 24-Jul-2007 13:59
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Hello Everyone,

We use Netgear routers with XNET for their VOIP Product, but they don't do VOIP QoS because XNET use non-standard ports for their VOIP Product.

So... If we have a SPA2102 daisy chained between the Netgear and the LAN, will this do QoS for all the VOIP traffic passing through it?

To be honest, even pushing downloads of 400KB/s we don't get phone call break ups, but would like to have this setup right.




Tyler - Parnell Geek - iPhone 3G - Lenovo X301 - Kaseya - Great Western Steak House, these are some of my favourite things.

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  Reply # 79440 24-Jul-2007 14:33
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VFX uses less that 64kbps (8kBps), so you probably do not need QOS while on a fast connection.  It is my understanding that your router will simply pass on the QoS data and it will get managed upstream somewhere.  If you can not setup QoS for a non-standard port, then possibly you can increase the priority for a specific Ethernet port on which the VFX box is.

I believe the SPA2102 pass through device will manage the QoS for you for any data coming through it.




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  Reply # 79446 24-Jul-2007 15:22
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If the router supports QoS there are normally three ways if implimenting QoS - L7 based QoS, MAC based QoS and port based QoS. L7 is the fastest, followe by MAC address and port based is the slowest. Neither L7 or MAC address filtering care what port the traffic uses as the L7 detects the traffic type (SIP & RTSP) and MAC gives priority to all traffic that passes through the ATA or phone.

What routers are you using and what QoS support do they actually have? If it is only port based regardless of what ports VFX use you should be able to set port based QoS without a problem.


 
 
 
 


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  Reply # 79461 24-Jul-2007 17:20
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Dlink make a little VoIP accelerator, have not used it or bothered to look into it too much at this stage:

http://www.amazon.com/Internet-Accelerator-Intelligent-Packet-Priority/dp/B0009VU7GC

Sbiddle, are your sure layer 7 is the fastest...it would require the deepest packet inspection and processing when you think about it.

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  Reply # 79466 24-Jul-2007 17:47
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Fraktul: Dlink make a little VoIP accelerator, have not used it or bothered to look into it too much at this stage:

http://www.amazon.com/Internet-Accelerator-Intelligent-Packet-Priority/dp/B0009VU7GC

Sbiddle, are your sure layer 7 is the fastest...it would require the deepest packet inspection and processing when you think about it.


Oops I stand corrected on that. MAC is the fastest but L7 filtering can be the most efficient since it doesn't require setting up port ranges or MAC addresses which is particularly useful if you have multiple WiFi devices connecting to a network. Setting one filter for an application rather than setting multiple port ranges can also make like e alot easier for somebody who doesn't have a lot of knowledge.




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  Reply # 79468 24-Jul-2007 17:55
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Fraktul: Dlink make a little VoIP accelerator, have not used it or bothered to look into it too much at this stage:

http://www.amazon.com/Internet-Accelerator-Intelligent-Packet-Priority/dp/B0009VU7GC


I read a few forum posts about these a while back and people seemed to be impressed with them. They need to sit between your modem and router or if you have a combined modem/router you need to fit the unit between the LAN port and another switch so all traffic can pass through the unit so it can prioritise the traffic.


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  Reply # 79503 24-Jul-2007 21:25
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sbiddle:
Fraktul: Dlink make a little VoIP accelerator, have not used it or bothered to look into it too much at this stage:

http://www.amazon.com/Internet-Accelerator-Intelligent-Packet-Priority/dp/B0009VU7GC


I read a few forum posts about these a while back and people seemed to be impressed with them. They need to sit between your modem and router or if you have a combined modem/router you need to fit the unit between the LAN port and another switch so all traffic can pass through the unit so it can prioritise the traffic.




I would be really keen on talking to someone that has one of thos Dlink acclerators..
Im going to be changing flats next year and need something that will do a good job of traffic shaping ect...

Will be in a flat of 5 PCs and will have from Mid Downloaders.. 2 Gamers + 1 VFX system

Need something like this mostly for the Gaming to keep pings down when people are Downloading.

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  Reply # 79504 24-Jul-2007 21:29
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For around the same price however you can buy a router like a WRT54GL that does the same or better with 3rd party firmware.



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  Reply # 79523 25-Jul-2007 00:48
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These are all excellent answers, but I'm really looking for a solution which is also acceptable, and supported by WorldXchange using only the products certified by them on the Supported hardware page

http://www.xnet.co.nz/vfx/hardware.shtml

We are putting in a switch, which could do L7 shaping, but I want to do the shaping on a WFX supported device, so that we can provide a service which can be supported by WorldXchange. Using the Linksys SPA2102 would do this, if it ALSO shapes the traffic for QoS flowing from the LAN port to the WAN Port - and the Netgear router can then see these packets tagged as QoS.

I guess the other answer is to use the Linksys WAG54GP2. Sigh. Linksys routers suck - and no I can't load the custom firmware, we have to run the WorldXchange supported firmware.

To the person which answered about the bandwidth requirements, we will hit the top of headroom on that as well, as we will be running 10 telephone lines, potentially (but unlikely) all used at once. This means 650kb traffic, on a bad internet link the upstream would be less than this. Unless my math on kb/Kb/bps is wrong. It's late, I'm tired and so yeah :-)

The other option is we get another internet link simply for the VOIP traffic, then we only pay $50 a month for the connection, and the VOIP traffic is all free. :-)





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  Reply # 79524 25-Jul-2007 01:00
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exportgoldman:

...we will be running 10 telephone lines, potentially (but unlikely) all used at once. This means 650kb traffic, on a bad internet link the upstream would be less than this. Unless my math on kb/Kb/bps is wrong. It's late, I'm tired and so yeah :-)

In my experience, VFX uses about 30 or 32kbps in each direction when using the G729a codec.

So your peak traffic would be 320kbps for 10 phone conversations if they were all going at once.

The SPA2102 prioritises OUTGOING traffic only which will take care of TRANSMITTED audio.

If you want to eliminate breakup on RECEIVED audio, you need to reserve a percentage of your INCOMING bandwidth for VFX traffic.  I found this was necessary when using a wireless connection with only 512kbps bandwidth, but you are presumably using a DSL connection with Max/Max speeds so it should not be necessary in your case.

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  Reply # 79534 25-Jul-2007 07:42
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When I was on 256k/128k ADSL, I had absolutely no issues with VFX even while downloading files.  With XNet when you go over your data cap, your connection is throttled to 64k which they consider still to be more than enough for running VFX.  Wireless, however, has more error packets and momentarily drop-outs and jitter and...




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