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.
#53064 by sniffbert
Thu Apr 15, 2010 6:27 am
Continues to happen, both morning and evening. For what it's worth, I'm using Comcast cable. Speedtest shows about 6Mbps down and 5Mbps up. Ping is about 25ms. My own QOS is set at 2458kbps for up (based on past tests) and default (0) setting for down. My ooma telo device is running with revision 1.36111.
#53089 by Groundhound
Thu Apr 15, 2010 9:41 am
sniffbert wrote: My own QOS is set at 2458kbps for up (based on past tests)

What kind of tests? Most speed test results are distorted for Comcast due to Powerboost, so your setting may be too high if your subscribed speed tier is 2 Mbps upstream. If you are on the 12/2 or 16/2 plan with Comcast, try setting your upstream QoS lower, about 1600 Kbps.
#53195 by PHXHoward
Fri Apr 16, 2010 2:28 pm
Not sure if it is the same problem but when I make a call, the other person can not hear me.

I unplug the Ooma and then plug it back in and things work fine for a while but then I'll call someone and they can't hear me again.
#53340 by sniffbert
Mon Apr 19, 2010 6:40 am
Groundhound wrote:
sniffbert wrote: My own QOS is set at 2458kbps for up (based on past tests)

What kind of tests? Most speed test results are distorted for Comcast due to Powerboost, so your setting may be too high if your subscribed speed tier is 2 Mbps upstream. If you are on the 12/2 or 16/2 plan with Comcast, try setting your upstream QoS lower, about 1600 Kbps.


Sorry about the delay. This weekend, I set my uplink QOS to 1600, but unfortunately the problem is still with us.

Curious if there is a respected site for gaining performance information. Many just provide data to/from the closest location. Wouldn't it be better to verify data to/from the ooma server? How?
#53500 by DeweyJLeviei
Wed Apr 21, 2010 9:50 am
Please add me to the list. My brother got very frustrated speaking with me last night as he couldn't hear me several times during the call. I told him that I was generally happy with Ooma, but this is unacceptable. I tried to reconfigure Quality of Service, but I don't think it changed things. Why this all of the sudden?
#53501 by lbmofo
Wed Apr 21, 2010 10:01 am
Not sure how your VoIP quality tests look like. But you can also check Cable Modem if your ISP is Cable.

murphy wrote: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.

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.
#53544 by sniffbert
Wed Apr 21, 2010 6:12 pm
Here is everything available from my Cable modem (Motorola Surfboard):

Downstream Value
Frequency 687000000 Hz
Signal to Noise Ratio 27 dB
QAM QAM256
Network Access Control Object ON
Power Level -7 dBmV
The Downstream Power Level reading is a snapshot taken at the time this page was requested. Please Reload/Refresh this Page for a new reading

Upstream Value
Channel ID 10
Frequency 29600000 Hz
Ranging Service ID 5633
Symbol Rate 2.560 Msym/s
Power Level 45 dBmV

As far as whichVoiP readings, some things look good; others look very bad. Interesting ... if this has anything to do with it, interesting that it happened to many different people, all about approximately the same time.

VoIP test statistics
--------------------
Jitter: you --> server: 1.3 ms
Jitter: server --> you: 3.7 ms
Packet loss: you --> server: 53.8 %
Packet loss: server --> you: 0.4 %
Packet discards: 0.0 %
Packets out of order: 0.0 %
Estimated MOS score: 3.5

Speed test statistics
---------------------
Download speed: 869376 bps
Upload speed: 603496 bps
Download quality of service: 57 %
Upload quality of service: -- %
Download test type: socket
Upload test type: HTTP
Maximum TCP delay: 475 ms
Average download pause: 29 ms
Minimum round trip time to server: 86 ms
Average round trip time to server: 88 ms
Estimated download bandwidth: 2720000bps
Route concurrency: 3.1286807
Download TCP forced idle: 0 %
Maximum route speed: 6096272bps

Re-doing the test a few seconds later; I can get different results. Here is one example (I've seen 0% loss, 2Mbps upload, and ...):

VoIP test statistics
--------------------
Jitter: you --> server: 1.8 ms
Jitter: server --> you: 3.5 ms
Packet loss: you --> server: 15.8 %
Packet loss: server --> you: 2.2 %
Packet discards: 0.0 %
Packets out of order: 0.0 %
Estimated MOS score: 3.6

Speed test statistics
---------------------
Download speed: 87544 bps
Upload speed: 262568 bps
Download quality of service: 0 %
Upload quality of service: -- %
Download test type: socket
Upload test type: HTTP
Maximum TCP delay: 36613 ms
Average download pause: 299 ms
Minimum round trip time to server: 87 ms
Average round trip time to server: 89 ms
Estimated download bandwidth: 87544bps
Route concurrency: --
Download TCP forced idle: --
Maximum route speed: 6026200bps

How can I prove if it's modem, network, ...?
#53549 by lbmofo
Wed Apr 21, 2010 6:35 pm
The packet loss and TCP delays don't look too good. The Signal to Noise ratio is low too. Hopefully murphy & others can chime in with some corrective action suggestions. Minimize cable splits, etc. But here is a good read.

A family member had intermittent issues with call quality and these tests would look fine most of the time but once in a while would go belly up. Turns out, it was his modem. With a new modem, his problem was all fixed. If you lease the modem, get a different one and test it out. If not, try to see if other corrective actions would improve the situation first.

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