Multicast options not in manual

[USTI]

I use Yealink phones for my customer 3cx deployments. In the 3cx template for the T4x series phones, these items are listed but commented out:

##V81 NEW##
#multicast.listen_address.X.volume =
#multicast.receive.enhance_volume =
#multicast.receive.use_speaker =
#multicast.listen_address.X.channel=
#multicast.paging_address.X.channel=

I was unable to locate these in the administrator manual for the Yealink phones. Even a Google search did not turn up much for these strings. I really could potentially use the enhance volume configurations for some customers who complain about low volume during pages.

Any insight would be appreciated.

Thanks.