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.
#68042 by Miss Kris
Mon Nov 01, 2010 5:54 pm
Hi everyone! I recently purchased the Ooma Hub/Scout. I followed the quick start guide very carefully and hooked the Hub up according to the directions for Cable connections with both a router & modem. I am not using a Scout. My Comcast speeds are 15/5. When I make a call, I hear static every few seconds and the person on the other end said I sound like I'm breaking up / like I'm on a cheap phone. The phone isn't the problem, because it was fine when I was on Verizon landline service.

I tried to follow the 75% upstream/downstream rule and it didn't help. For now, I returned all QOS settings back to default, even though it's still not making a difference.

I ran several tests on different sites, and here are the results (while on the phone):

SpeedTest.net:

Download Speed: 17.69 mb/s
Upload Speed: .32 mb/s
Ping: 99 ms

PingTest.net

Packet Loss: 0%
Ping: 29 ms
Jitter: 3ms
Grade: A

ICSI Netalyzr:

Major Abnormalities: Your DNS resolver returns results even when no such server exists

Visualware:

Download speed: 7.60 mbps
Upload Speed: 455 kbps
Quality of Service : 18%
Maximum download pause: 184 ms
Average download pause: 4ms
Minimum round trip time to server: 34 ms
Average round trip time to server: 56 ms


Here is what I get when the phone is NOT in use:

SpeedTest.net:

Download Speed: 16.71 mb/s
Upload Speed: 3.81 mb/s
Ping: 58 ms

PingTest.net

Packet Loss: 0%
Ping: 41 ms
Jitter: 20 ms
Grade: B

ICSI Netalyzr:

Major Abnormalities: Your DNS resolver returns results even when no such server exists


Visualware:

Download speed: 4.87 mbps (out of about 16.8 mbps)
Upload Speed: 3.9 mbps
Quality of Service : 18%
Maximum download pause: 598 ms
Average download pause: 6ms
Minimum round trip time to server: 34 ms
Average round trip time to server: 44 ms


Any help would be greatly appreciated! I've spent hours looking at other posts and can't figure out what to do to make the call quality better. Thank you in advance!
#68114 by lbmofo
Tue Nov 02, 2010 10:48 am
Your upstream speeds look weird when you are on the phone.

Set upstream/downstream to 0 to turn off QoS to do some tests.

VoIP Quality Test:

http://www.whichvoip.com/voip/speed_test/ppspeed.html

Check out the advanced tab.
Jitter should be less than 5 ms.
Packet loss should be 0.
Download and upload QOS should be at least 70%.
Maximum TCP delay should be under 100 ms.

If you are really getting 5 mbps/s up from speedtest.net, then your upstream QoS setting should be 4000; leave downstream setting at 0.

Do the optimal setup: viewtopic.php?t=9536#p66155

If you are still having issues, then either your ooma device is bad or your cable modem is bad (or your cable line condition is bad). Cable modem problem is more likely if your ooma device is new.

murphy wrote:Try this. Connect to the status web page in your cable modem

http://192.168.100.1

Find the downstream and upstream power in dBmV and the Signal to Noise Ratio (SNR) and report back.

The downstream signal power should be between -10 and +10 dBmV. (Some say between -15 and +15 but I feel that is pushing your luck)

The SNR should be 35 or more.

The upstream power level should be less than 55 dBmV.
#68145 by Miss Kris
Tue Nov 02, 2010 2:49 pm
Thank you for your reply! Using the website that you sent, here is the result after setting QoS to 0/0 while NOT on the phone:
VoIP test statistics
--------------------
Jitter: you --> server: 5.6 ms
Jitter: server --> you: 7.2 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: 3504712 bps
Upload speed: 3872312 bps
Download quality of service: 18 %
Upload quality of service: 97 %
Download test type: socket
Upload test type: socket
Maximum TCP delay: 505 ms
Average download pause: 8 ms
Minimum round trip time to server: 94 ms
Average round trip time to server: 162 ms
Estimated download bandwidth: 21600000bps
Route concurrency: 6.163131
Download TCP forced idle: 85 %
Maximum route speed: 5577440bps

And here is the result while on the phone:

VoIP test statistics
--------------------
Jitter: you --> server: 16.2 ms
Jitter: server --> you: 15.3 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: 4319872 bps
Upload speed: 3926520 bps
Download quality of service: 32 %
Upload quality of service: 88 %
Download test type: socket
Upload test type: socket
Maximum TCP delay: 505 ms
Average download pause: 6 ms
Minimum round trip time to server: 92 ms
Average round trip time to server: 95 ms
Estimated download bandwidth: 22400000bps
Route concurrency: 5.185339
Download TCP forced idle: 75 %
Maximum route speed: 5698688bps
#68151 by lbmofo
Tue Nov 02, 2010 3:11 pm
Looks like you have some issues with max tcp delay....500+ ms, not too good.

What is your download/upload speed looking like using speedtest.net? Aren't you supposed to be getting 15 mbps/s down?

Check out your modem setup page too to see if your line quality is bad.
Last edited by lbmofo on Tue Nov 02, 2010 3:11 pm, edited 1 time in total.
#68153 by Miss Kris
Tue Nov 02, 2010 3:11 pm
Here is my Cable Modem Stats, as requested:


Downstream
Downstream 1 3.51 dBmV 37.94 dB SNR
Downstream 2 4.35 dBmV 37.09 dB SNR
Downstream 3 4.03 dBmV 37.09 dB SNR
Downstream 4 3.70 dBmV 36.84 dB SNR

Upstream

Upstream 1 47.25 dBmV
#68154 by lbmofo
Tue Nov 02, 2010 3:13 pm
Miss Kris wrote:Here is my Cable Modem Stats, as requested:


Downstream
Downstream 1 3.51 dBmV 37.94 dB SNR
Downstream 2 4.35 dBmV 37.09 dB SNR
Downstream 3 4.03 dBmV 37.09 dB SNR
Downstream 4 3.70 dBmV 36.84 dB SNR

Upstream

Upstream 1 47.25 dBmV

Must be DOCSIS 3? These look okay.
#68156 by Miss Kris
Tue Nov 02, 2010 3:17 pm
Again, thank you so much for all of your help!

My Speedtest.net while Not on the phone:

19.07 download ; 3.61 upload; ping 52 ms

My Speedtest.net while ON the phone:

18.20 download; 3.71 upload; ping 57 ms
#68159 by Miss Kris
Tue Nov 02, 2010 3:36 pm
I set my QoS upstream to 3072. I re-ran the test and here are the results. Not much change:

VoIP test statistics
--------------------
Jitter: you --> server: 18.9 ms
Jitter: server --> you: 18.9 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: 2595704 bps
Upload speed: 3425208 bps
Download quality of service: 10 %
Upload quality of service: 89 %
Download test type: socket
Upload test type: socket
Maximum TCP delay: 579 ms
Average download pause: 12 ms
Minimum round trip time to server: 94 ms
Average round trip time to server: 182 ms
Estimated download bandwidth: 23200000bps
Route concurrency: 8.937845
Download TCP forced idle: 87 %
Maximum route speed: 5577440bps

Any way to improve the Max TCP Delay number?
#68162 by lbmofo
Tue Nov 02, 2010 4:11 pm
Have you done the "Use Built in Modem Port MAC address?" Link provided in previous post (optimal setup).
Once done, turn off everything, then power up modem, wait til it goes online, then bring up the ooma, wait til it turns blue, then turn on the router.

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