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.
#103566 by karnold002
Tue Nov 27, 2012 7:01 am

I have a combo cable router box/modem. My Telo is plugged directly into modem.

When I do the phone speed test, I get very high jitter times. I power cycle the cable modem and things return to normal - for about 3 days. Rinse, repeat. When the jitter gets high, I get a squealing sound on my end - the other side hears just fine.

I've done everything I can do reading here - set the QOS, disabled the DECT, set the MAC address, etc. If I Google this, I see sites like which seems to indicate it is a problem with the VOIP provider. Then there are other articles like which suggest using a CAT-6 cable.

The latter also mentions a "jitter buffer" - anyone know about this on OOMA?

I've just opened a ticket with my ISP - and I fully expect the "deer in the headlights" response. But since recycling the cable modem appears to fix the problem, I suspect this probably is more of an ISP issue.

I've not yet contacted OOMA support directly - that's next on my list too.

Any other thoughts? My wife wants to go back to POTS. Thank you in advance!!
#103579 by lbmofo
Tue Nov 27, 2012 12:16 pm
How old is your modem? If increased uptime is the only reason you see high jitter (not certain time of the day or night etc), I think it might be your modem. You can pick up a SB6121 for less than $75 from Costco or Amazon for less than $80

Of course, since your modem is also a router, you'd need to pick up a router. Worth a try given your alternative (POTS) is a new modem/router every 2 to 3 months (paying POTS bills).
#103587 by thunderbird
Tue Nov 27, 2012 3:40 pm
Check your Modem/Router owner's manual and see if it has a reset procedure. If so do a reset of the the Modem/Router using the instructions in the Modem/Router owner's manual.

Note: some Modems contain a battery that must be temporarily removed the have a successful Modem reset or reboot.

If after the Modem Reset or reboot, if you continue to have problems, the Modem or Internet signal is probably defective. First try another modem.

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