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264 posts

Ultimate Geek
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Topic # 107458 12-Aug-2012 15:18 Send private message

Hi

I have been using Voip for quite some time on 2talk without issues, I recently upgraded from a Linksys ATA to a Gigaset A580IP.

Since then I have had issues with dropouts.   These only seem to affect the audio at my end and are not present on the call recordings downloaded from 2talk. 

Testing has revealed that the usual ping to 2talk is about 29ms, but even small things like download a website can cause spikes of 130ms to 300ms momentarily, which seem to coincide with the dropouts. 

I have tried configuring Qos on my router and putting the IP of the phone into the premium traffic group without any luck.  It seems Qos can't prioritise the downstream traffic.

The only way I could eliminate the spikes was to set the max download to 5mbps, but that is artificially limiting me to 1/3 of the connection speed. 

I can confirm it is downstream traffic by running a speed test on speedtest.net, the ping will spike during the download test, but is fine during the upload test. 

How do other people handle voip if something else is going on in the house?  I would have thought a 15mbps connection could handle someone browsing the web at the same time as a single call.

I am in CHCH and on Telstra Cable. 

Any ideas?




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801 posts

Ultimate Geek
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  Reply # 671457 12-Aug-2012 15:57 Send private message

What type of router do you have?




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19260 posts

Uber Geek
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  Reply # 671485 12-Aug-2012 16:44 Send private message

QoS can't work fully on a downstream connection when it's only configured in your CPE because you have no way of controlling the flow of packets to your router from your ISP. With TCP you can discard packets and control the ACK but with UDP you have no such ability. With downstream QoS you need to set your limits at around 80% of your maximum speed so the router can in effect step in and attempt to control the packet flow.

Without knowing your type of router and exactly how it's configured it's a little hard to comment further, but if your pings are increasing to high levels such as that it clearly shows your maxing out your connection causing packets to be queued by your ISP.


570 posts

Ultimate Geek
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  Reply # 671575 12-Aug-2012 20:37

If you are on 2talk I'd recommend you switch to their newer 'plus' platform. They are promoting it as a beta product, but from my experience it has less of the lag/dropouts etc. Config info is on their site etc.



264 posts

Ultimate Geek
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  Reply # 671919 13-Aug-2012 19:32 Send private message

Hi

I moved to 2talk plus a few months ago, I forgot to mention that.

I am using a netgear with dd-wrt on it. (latest build).

Here is the QoS settings I am using.   151 is the gigaset, 203 is my laptop I am using for ping tests and 204 is my desktop which I am browsing with. (Note the limits are greyed out when a priority is set to anything other than manual, so they are not applying).

http://postimage.org/image/rkoxd31jb/full/

The only way I seemed to be able to stop the latency issues was to set the downlink at the top at 5000kbps, but that seems not that suitable as it artificially limits my download speed to 1/3rd and is a lot less than the 80% that most people seem to say.

 

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Ultimate Geek
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  Reply # 671934 13-Aug-2012 19:55 Send private message

Thanks Mike

My question around the router was to gauge the age of the unit; your internet connection is obviously running at full pelt (since the link is filling and staying filled), which suggests to me that your router might not be man enough to clear all those incoming packets fast enough.

Just because a port is classified as being '100mbps or 1gbps' does not mean the router has got the  horsepower to clear all that bandwidth, especially once you start forcing it to diagnose packets for priority and so on. I can't tell what make and model your router is or it's age from your comments - but a large amount of consumer CPE is low-power (which is why they can be so cheap)

A




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