Due to some furniture rearrangement, I ended up with with my 5th gen Apple Extreme Airport router (Dual band 3x3 MIMO) and Panasonic DECT 6.0 basestation about 1+ feet apart.
Outgoing voice would have really weird intermittent problems. Lots of drops that make voice sound crackled. Sometimes going blank all together. Incoming had no problems at all and always perfectly clear. Below are my debugging trials
- When I use google hangout app on a smartphone over wifi to my router with the same googlevoice account on the Obi, it worked perfect.
- Ran all kinds of test to check ping, up/down speed/jitter etc.. everything looked fine.
- I had a OOMA that was exhibiting the same problem installed both before or behind the router.
These ruled out ISP + googlevoice infrastructure as problems. It also likely ruled out router/QoS unless the ethernet connection somehow behaves worse than the wifi connection. OOMA installed before the router also would suggest router isn't the issue.
So there is only 1 piece of equipment left and that is the DECT 6 system. Plugged in a corded phone and all problems went away.
Googled "dect phone wifi router" and this following link showed up
http://www.edn.com/electronics-blogs/brians-brain/4398954/Debugging-DECT--Wi-Fi-has-a-derogatory-effectSo I moved DECT 6 base station to about 10+ feet away and all problems went away.
This it not an OBI problem per say. However, VOIP involving a wifi router and DECT 6 phones are common these days. Given ethernet and telephone wire lengths, they might often end up next to each other and we end up chasing what we think are network service issues as digital voice problems all sounds the same
Hope this helps someone battling outgoing voice problems.