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.
#44508 by carlben
Fri Jan 29, 2010 6:30 pm
I am new to ooma. I have the Telo placed between my modem and router. I originally had the Qos at the default setting but then changed it to 720 to see if it could fix the problem I am about to describe. My upload internet speed is .9mgs.
When on the phone I will get periodic episodes (maybe 2 times in an hour) when the person on the other end thinks we have been disconnected. Apparently, the phone sounds dead and the other person says, "are you still there" and are unable to hear me when I say that I am. I can hear them clearly. After 2-4 seconds it clears up and the other person can hear me again. What could be causing this problem, and is there anything I can do to fix. As I said, changing the upload setting from default to 720 didn't help. Thanks for any help.

One other thing. This is happening when there is nothing else going on with my computer, meaning that no one is downloading or uploading anything.
#44533 by george3k
Fri Jan 29, 2010 9:10 pm
I'm having the same problem. I'm on Comcast for my ISP and using Ooma Core that is directly plugged into my modem and the router into Ooma.

I believe that my bandwidth isn't a problem:

http://www.speedtest.net/result/699428199.png

Using:

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

My test results were:

VoIP test statistics
--------------------
Jitter: you --> server: 0.9 ms
Jitter: server --> you: 3.6 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: 4.0

Speed test statistics
---------------------
Download speed: 5903584 bps
Upload speed: 2446648 bps
Download quality of service: 98 %
Upload quality of service: 43 %
Download test type: socket
Upload test type: socket
Maximum TCP delay: 15 ms
Average download pause: 2 ms
Minimum round trip time to server: 93 ms
Average round trip time to server: 95 ms
Estimated download bandwidth: 20000000bps
Route concurrency: 3.3877726
Download TCP forced idle: 72 %
Maximum route speed: --

I did notice here that my upload QoS was fairly bad, 43%--I'm curious if perhaps this might be the reason why periodically the line drops and then re-establishes as carlben reports as well. Is this something that I should be reporting to Comcast--would they even do anything about it?

Within Ooma, I have setup the QoS so that my Upstream Internet Speed (Kbps) is 1000, even though my overall uplink is much higher and my Reserved Bandwidth for Calls (Kbps) is 130 (default).

I have to admit this behavior is really annoying because I use Ooma while I work from home (3 days a week) and to be on a call and have it suddenly drop all the sound and then re-establish a second or two later is just not a good thing. Does anyone have any suggestions on things to try? Does my Ooma device need an update to the firmware or something else?

Cheers,
George
#44542 by murphy
Sat Jan 30, 2010 3:57 am
With speeds that high you should not need QOS at all. Try setting both download and upload to 0 (disabled).
The general recommendation is to set the QOS at 80% of your actual speed.
#44547 by carlben
Sat Jan 30, 2010 5:16 am
Well, I ran the VOIP test per your link and came up with these results:

VoIP test statistics
--------------------
Jitter: you --> server: 0.6 ms
Jitter: server --> you: 5.1 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: 4.0

Speed test statistics
---------------------
Download speed: 3870952 bps
Upload speed: 955720 bps
Download quality of service: 40 %
Upload quality of service: 99 %
Download test type: socket
Upload test type: socket
Maximum TCP delay: 445 ms
Average download pause: 3 ms
Minimum round trip time to server: 77 ms
Average round trip time to server: 114 ms
Estimated download bandwidth: 5600000bps
Route concurrency: 1.4466726
Download TCP forced idle: 18 %
Maximum route speed: 6808824bps

Of course, I don't understand what much of this means. Murphy, you suggested setting Qos for upload and download at 0 because of the internet speed reported by George 3k. I don't believe my internet speed is as fast as his. Do you have any suggestions for me based on my test data?
#44590 by murphy
Sat Jan 30, 2010 9:04 am
Your download jitter is bad.
Your download Quality of service is bad.
Your Maximum TCP delay is very bad.

Your speeds are good but the jitter and delay are a problem.

Connect to the following URL: http://192.168.100.1

This is the status page in your cable modem.
Report what your download and upload power levels are and the SNR (Signal to Noise Ratio).
#44905 by peachkid
Mon Feb 01, 2010 5:35 pm
I've got exact same issue ... so bad it is forcing back to old telephone line. Speed/Jitter tests indicate broadband is good for VOIP. Please post your solution, if you find one.
#44906 by peachkid
Mon Feb 01, 2010 5:39 pm
below are my service stats:

VoIP test statistics
--------------------
Jitter: you --> server: 0.8 ms
Jitter: server --> you: 0.9 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: 4.2

Speed test statistics
---------------------
Download speed: 3792400 bps
Upload speed: 2767456 bps
Download quality of service: 57 %
Upload quality of service: 97 %
Download test type: socket
Upload test type: socket
Maximum TCP delay: 245 ms
Average download pause: 5 ms
Minimum round trip time to server: 14 ms
Average round trip time to server: 15 ms
Estimated download bandwidth: 9600000bps
Route concurrency: 2.5313785
Download TCP forced idle: 0 %
Maximum route speed: 37448568bps
#44907 by peachkid
Mon Feb 01, 2010 5:41 pm
here are my modem page stats:

Downstream
Freq/Power: 561.000 MHz -1 dBmV
Signal to Noise Ratio: 37 dB
Modulation: QAM256
Upstream
Freq/Power: 26.112 MHz 54 dBmV
Channel Type: DOCSIS 1.x (TDMA)
Symbol Rate: 2560 kSym/sec
Modulation: QAM16
#44927 by Groundhound
Mon Feb 01, 2010 8:26 pm
peachkid wrote:here are my modem page stats:

Downstream
Freq/Power: 561.000 MHz -1 dBmV
Signal to Noise Ratio: 37 dB
Modulation: QAM256
Upstream
Freq/Power: 26.112 MHz 54 dBmV
Channel Type: DOCSIS 1.x (TDMA)
Symbol Rate: 2560 kSym/sec
Modulation: QAM16

Your upstream power at 54 dBmV is on the high side, see this: http://www.dslreports.com/faq/3412. If you can check your cable connections and/or remove any unneeded splitters it may help. If not you may need to get some help from your cable provider.
#45019 by luntam
Tue Feb 02, 2010 11:28 pm
I have a 2-4 second delay after I pickup the phone (2 rings from the caller). I have to say 'Hi' again to ensure we didn't get disconnected and then the caller response by saying 'Hi'. After that, the conversation is normal and very clear.

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