This forum includes tips for maintaining the best audio quality possible with the Ooma System. If your Ooma system is having issues with dropped calls, static audio or echo, look here for assistance.
#25243 by jorossi
Fri Oct 09, 2009 1:30 pm
I'm having issues with a Clear WiMax configuration with OOMA. The OOMA Hub is between the WiMax modem and my Linksys WRT54GL router. I have a wired phone connected directly to the hub. Incoming voice sounds fine but I'm told that my outgoing voice sounds 'broken up.'

My upload QoS looks pretty poor... any ideas on what I may be able to do to improve the situation?

VoIP test statistics
--------------------
Jitter: you --> server: 21.1 ms
Jitter: server --> you: 6.3 ms
Packet loss: you --> server: 0.0 %
Packet loss: server --> you: 0.0 %
Packet discards: 0.0 %
Packets out of order: 0.0 %
Estimated MOS score: 3.8

Speed test statistics
---------------------
Download speed: 2130848 bps
Upload speed: 409688 bps
Download quality of service: 62 %
Upload quality of service: 36 %
Download test type: socket
Upload test type: socket
Maximum TCP delay: 157 ms
Average download pause: 7 ms
Minimum round trip time to server: 119 ms
Average round trip time to server: 182 ms
Estimated download bandwidth: 5360000bps
Route concurrency: 2.5154305
Download TCP forced idle: 46 %
Maximum route speed: 4405712bps

Everything seems ok (voice quality wise - no complains from caller/callee) when using my old DSL connection. Here are the stats from DSL for reference:


VoIP test statistics
--------------------
Jitter: you --> server: 0.1 ms
Jitter: server --> you: 14.5 ms
Packet loss: you --> server: 0.0 %
Packet loss: server --> you: 0.2 %
Packet discards: 0.0 %
Packets out of order: 0.0 %
Estimated MOS score: 3.7

Speed test statistics
---------------------
Download speed: 1145520 bps
Upload speed: 574648 bps
Download quality of service: 55 %
Upload quality of service: 96 %
Download test type: socket
Upload test type: socket
Maximum TCP delay: 637 ms
Average download pause: 10 ms
Minimum round trip time to server: 70 ms
Average round trip time to server: 71 ms
Estimated download bandwidth: 1360000bps
Route concurrency: 1.1872337
Download TCP forced idle: 0 %
Maximum route speed: 7489712bps
Last edited by jorossi on Fri Oct 09, 2009 4:35 pm, edited 1 time in total.
#25270 by niknak
Fri Oct 09, 2009 3:32 pm
...Everything seems ok (voice quality wise - no complains from caller/callee) when using my old DSL connection. Here are the stats from DSL for reference...


...maximum TCP Delay 637ms...


As you mentioned your Download QOS in both cases is not very good, also the TCP Delay is bad in the first case and very bad in the second case ( any value here over 100ms and VOIP call quality is going to suffer)
you have issues with your network that may be related to your ISP - not OOMA
#25280 by niknak
Fri Oct 09, 2009 3:48 pm
those stats are constantly changing...you might have tested during a network "hiccup" and got the high readings
in both cases the download QOS is not great...have you tried resetting the hub and then rebooting all of your network devices?
#25293 by jorossi
Fri Oct 09, 2009 4:29 pm
niknak wrote:have you tried resetting the hub and then rebooting all of your network devices?


Yes, I've tried this many times. I'm assuming either the upload QoS or jitter is causing the problem (again, only the 1st case, Clear WiMax, is having the issue... the second case, Qwest DSL, does not have the issue). The DSL TCP delay is huge but doesn't seem to be an issue in this case.

I've tried fiddling with the QoS settings in the hub as well as router (swapping the hub to the other side of the router). Still no luck. Is this an artifact of WiMax? I have a couple more days of my 7-day WiMax trial left... looks like the modem may be going back.
#25297 by niknak
Fri Oct 09, 2009 4:51 pm
do you use cordless phones? I have read other posts where 2.4GHz and 5.8GHz phones can interfere with wireless modems
( even some phones that work at 5.8GHz in one direction also run at 2.4GHz) possible interference to the wireless modem is causing delays leading to poor VOIP quality
#25381 by jorossi
Sat Oct 10, 2009 9:21 am
I relocated the WiMax modem to the attic... I now get 4-5 bars of signal (previously I was getting 2-3 bars). My speeds have improved but QoS has not. Here are the new stat's:

VoIP test statistics
--------------------
Jitter: you --> server: 12.7 ms
Jitter: server --> you: 3.0 ms
Packet loss: you --> server: 0.0 %
Packet loss: server --> you: 0.0 %
Packet discards: 0.0 %
Packets out of order: 0.0 %
Estimated MOS score: 3.9

Speed test statistics
---------------------
Download speed: 4457136 bps
Upload speed: 341376 bps
Download quality of service: 71 %
Upload quality of service: 46 %
Download test type: socket
Upload test type: socket
Maximum TCP delay: 239 ms
Average download pause: 4 ms
Minimum round trip time to server: 110 ms
Average round trip time to server: 113 ms
Estimated download bandwidth: 28800000bps
Route concurrency: 6.4615483
Download TCP forced idle: 84 %
Maximum route speed: 4766176bps
#26289 by mer
Wed Oct 14, 2009 5:29 pm
Having the same problem and it seems to be getting worse. I think it is Clear WiMax connection not the OOMA. I have a fast internet connection and a wireless DECT 6.0 phone. I talked with a customer service guy at the Clear store today and was told that many VOIP services do not work well with Clear wimax. Clear has their own VOIP, but I am not in a location to receive it. I am still in my 30 day return policy so think the OOMA will go back to BestBuy and I will have to use my cell phone service. Ooma a great idea if it works. Are there any folks out there that have been successful Clear WiMax users on Ooma out there?
#33843 by RobinsonHome
Wed Nov 18, 2009 12:00 pm
I've been having the same issues. Ooma worked wonderfully with clear.com when I first signed up in July, but since sept or Oct the "upload" voice quality has been poor. Has anyone discovered a possible solution? I've been on the phone with clear.com tech service (they are very patient and helpful by the way) trying to figure this out. At one point, the rep consulted their "voip" specialist and they suggested seeing if the following settings can be modified in the ooma box. I don't think we have access to these settings though (at least I don't see anything like it):

Jitter Buffer Settings Ø
Raise Nominal Delay from 60 to 100 Ø
Raise Minimum Delay from 20 to 80 Ø
Leave Max Delay the same @ 120
Modify Line Properties: Set Peak Time Voice down to 10 from 30

Any ideas or other clues?

Thanks,
David Robinson
#35215 by av8rdude
Mon Nov 30, 2009 12:46 pm
RobinsonHome wrote:I've been having the same issues. Ooma worked wonderfully with clear.com when I first signed up in July, but since sept or Oct the "upload" voice quality has been poor. Has anyone discovered a possible solution?


I've had the exact same issues. I got clear about 3 or 4 months ago and for the first month or so ooma worked perfectly. Now all my calls have the jitter on the other end of each call. Something either changed with clear or the ooma firmware to cause this. I've spent time on the phone with clear tech support and my connection is rock solid.

I wish there was a way to tweak the ooma settings to make it compatible with 4G???

Thanks,
Scott

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