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.
#99867 by cbareng
Tue Sep 04, 2012 8:56 pm
I'm having a similar problem with the callers on the other end not hearing me for extended periods. I've tried both modem (Motorola SB5120)>router (Linksys E1200)>ooma (with ooma set in DMZ) and modem>ooma>router. With modem>ooma>router, I tried the speed test and modem status and got the following. Modem status looks to be within what lbmofo posted (Mon Sep 03, 2012 11:18 am). What can I do in regard to the jitter and packet loss/discards? Should I try a different cable modem or "Reset All Defaults" on the current one? The ISP is Comcast in the SF Bay Area.

Speed test statistics
Download speed: 4236 kbps
Upload speed: 4174 kbps
Download consistency of service: 11 %
Upload consistency of service: 97 %
Download test type: socket
Upload test type: socket
Maximum TCP delay: 1813 ms
Average download pause: 4 ms
Minimum round trip time to server: 41 ms
Average round trip time to server: 50 ms
Estimated download bandwidth: 11200 kbps
Route concurrency: 2.643864
Download TCP forced idle: 8 %
Maximum route speed: 12787 kbps

VoIP test statistics
Jitter: you --> server: 31.5 ms
Jitter: server --> you: 0.5 ms
Packet loss: you --> server: 9.8 %
Packet loss: server --> you: 1.6 %
Packet discards: 4.8 %
Packets out of order: 0.0 %
Estimated MOS score: 1.0

Cable Modem Status
Downstream Value
Frequency 747000000 Hz
Signal to Noise Ratio 35 dB
Network Access Control Object ON
Power Level -4 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 5
Frequency 30600000 Hz
Ranging Service ID 5318
Symbol Rate 5.120 Msym/s
Power Level 40 dBmV
#99871 by murphy
Wed Sep 05, 2012 1:29 am
You need to get Comcast involved. They don't have any plans where the download and upload speeds are nearly identical. With an upload speed of 4000 your download speed should be over 20000 in that measurement.

Maximum TCP delay: 1813 ms should be less than 100 ms.

Jitter: you --> server: 31.5 ms should be less than 5 ms
Packet loss: you --> server: 9.8 % should be 0
Packet loss: server --> you: 1.6 % should be 0
Packet discards: 4.8 % should be 0

Rerun the tests with the computer connected directly to the cable modem. The cable modem will have to be turned off and then back on (required everytime you change what is connected to the cable modem).

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