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I've read about the QoS settings and done the speed tests, but calls (both incoming / outgoing) cut out after 10-15 seconds. I can hear the other party, but they can't hear me.

I've done quite a few speed tests:
Speedtest.net
download: 19mbps avg
upload: 4 mbps avg

whichvoip.com
achieved download: 4.4mbps avg (of 13.6 available)
upload: 1.94 mbps avg

I've set the QoS settings as follows:
upstream: 1500 kpbs
downstream: 2000 kpbs

Any thoughts?
Thanks

I've read about the QoS settings and done the speed tests, but calls (both incoming / outgoing) cut out after 10-15 seconds. I can hear the other party, but they can't hear me.

I've done quite a few speed tests:
Speedtest.net
download: 19mbps avg
upload: 4 mbps avg

whichvoip.com
achieved download: 4.4mbps avg (of 13.6 available)
upload: 1.94 mbps avg

I've set the QoS settings as follows:
upstream: 1500 kpbs
downstream: 2000 kpbs

Any thoughts?
Thanks

The whichvoip site is a good VoIP line quality test, but not such a good speed test. If you post all the results from the Advanced tab when the test is over it may shed some light on the problem.

Thanks GroundHound

Here are the Advanced results from www.whichvoip.com

VoIP test statistics
--------------------
Jitter: you --> server: 0.5 ms
Jitter: server --> you: 3.7 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: 3530264 bps
Upload speed: 2776216 bps
Download quality of service: 43 %
Upload quality of service: 97 %
Download test type: socket
Upload test type: socket
Maximum TCP delay: 239 ms
Average download pause: 4 ms
Minimum round trip time to server: 89 ms
Average round trip time to server: 90 ms
Estimated download bandwidth: 15200000bps
Route concurrency: 4.305627
Download TCP forced idle: 62 %
Maximum route speed: 5890784bps

Your problem description sounds related to upload quality issues, but the test did not specifically identify a problem there. The results of the whichvoip test had one area of concern, max TCP delay, but I don't know that that would account for what you are experiencing. Does it happen on all calls? Do you have a Telo or Hub? How is your Ooma connected to your modem (what kind) and router (also what kind)?