btw, Ooma allows testing using G.711 codec on a per call basis by dialing *98 before a phone number to enable it for that call only.
*96 Use low-bandwidth codec (iLBC) for this phone call, for Ooma Telo
*98 Use high-bandwidth codec (G711) for this phone call, for Ooma Telo
To enable G711 on your account for all calls by default, call Ooma's support or through the chat and ask "Can you set the flag 'RTP_USE_ULAW' for my account/line" ...it use to be through this post by Tom B has asked future requests to be done through chat: viewtopic.php?f=4&t=15628&hilit=g711&start=230
To repeat, the details above apply to the Ooma Telo which may or may not be exactly the same for Office, which for all I know may use G711 by default already.