| VOIP dropouts / poor "Consistency of Service" Recently, I have been hearing dropouts on a third party VOIP provider - and people on the other end hear them too.
I contacted the VOIP provider and they ran a VOIP test from voipreview which shows 40% or so "Consistency of Service" for download. Everything else is good.
The upload Consistency of Service is good (99%).
I have one OV line as well.
A) What could be causing the CoS issues? I tried the test with a PC directly to the modem to no avail. I tried using a router to reduce the max download speed, to no avail.
I never had the problems before the past couple of months.
B) Why would the upload be an issue, if the upload CoS is ok?
Thanks |
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| Re: VOIP dropouts / poor "Consistency of Service" Since your test is indicating it's a downstream issue, what download speed do you get? Do you see any packet loss or latency? Is the problem shown with any other bandwidth-intensive operations, such as streaming high-quality video (choppy audio/video or buffering)? |
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| The "CoS" test shows only download issues - but in a VOIP call you can here both upload and download dropouts/out of order packets.
In terms of download: Doing a speedtest, it always shows over 20 MBPS.
On voipreview.org the "download speed" always shows quite low, even when speedtest.net and others are showing over 20mpbs.
voipreview shows:
Download 1.39 mbpsof about 32.8mbps
upload 2.11 mbps (which is good)
Currently, d/l Consistency of service isn't as bad as it could be - but still not great.
d/l CoS 64%
u/l CoS 99%
Jitter and Packet loss are always very good when I test.
rtt 93 ms
max delay 395 ms
tcp max route speed 5.63 mbps
TCP forced idls 84%
route concurrenct 23.4
jitter .5 ms
packet loss 0%
I also wonder about the accuracy of the tests (their server load etc).. but I tried a few websites for voip testing already.
Thanks |
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| Did you get any more information? I am having similar issues |
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 christcorpPremium
join:2001-05-21
Cheyenne, WY
kudos:1 | reply to dzr
Many voip issues can be traced back to your network settings. It's not all about bandwidth. Voip, at the very most, only needs about 100K of bandwidth up and down. Normally, the issue is with router config, firewalls, and ports. Even if it worked previously, that doesn't mean that isn't the problem.
1. If your router has a place called ALG, there is a part for SIP. If this is turned on, it can conflict with the SIP your voip is trying to do. Turn off ALG
2. If your router has SPI (Also known as Firewall), this can cause a major issue with voip. Turn off the router's firewall. If you need a firewall, either use a separate free-standing firewall, or use software versions like zonealarm, black-ice, or even windows.
3. Main problem is usually ports not being forwarded; or forwarded improperly. Your voip provider should be able to tell you which ports need to be forwarded. As an experiment, you can give your voip adapter a static IP address from your router, and then put that IP address into the DMZ. The DMZ basically opens ALL ports to that IP address. If you have other apps/devices that need ports forwarded, then you already know how to do port forwarding. Ports are usually the reason for broken up audio in voip. Many times voip works fine until you add a device that needs a certain port, or you install and start playing a game that is using a port that your voip is trying to use. And remember: Voip uses UDP, not TCP. So if you do configure the ports, make sure you configure for UDP. |
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 dbmavenThere's no shortagePremium,Mod
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Sty in Sky
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| reply to dzr
I get horrible results @ voipreview - and I have no issues with speed or VoIP. It must be the location or quality of their server.
They use the Visualware test - so go there - »myspeed.visualware.com - click the map and choose a yellow pin, if you can, that has quality testing - there's one nearby in New York.
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Ad astra per alas porci!!
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