I'm not sure how much more simple to make it.
I use X.
I have A connected to B connected to C.
B is configured with N and M.
How is your B connected?
Do you use X?
That's the language part. Everything else is just technical terminology and if you are using PhonePower on Cox HSI then the product names should be familiar.
X = G711u (the high bandwidth codec which you configure on the PP web site)
A = Grandstream HT502 (the ATA)
B = TRENDnet TEW611-BRP (the router/firewall/switch)
C = Scientific Atlanta DPC2100R2 (the modem)
N = SPI (Stateful Packet Inspection)
M = SIP (Session Initiation Protocol)
I hope that clarifies any uncertainty so you can answer the questions.
It helps if you quote quotes. You can use the [qreply] button to make it easy.