Keep in mind that the lines coming out of Splitters/Filters for VDSL and ADSL are NOT FILTERED, they also still carry the Phone signals as well, because of being Unfiltered.
That applies also to the NTEs and their corresponding outputs.
Only the Phone Outputs from these Splitters etc are actually filtered; and that is basically to prevent the VDSL/ADSL signals going down to the Phone, ie they are High Frequency Rejection Filters, rather than Low/Audio Frequency Pass Filters.
HF Rejection Filters are quite small, as demonstrated by the general size of such Splitters and NTEs.
If 1) is exactly as stated, you should already be able to operate the Modem in "All the other rooms" whether you plug a Splitter in or not.
So you apparently already have what you want to achieve, in every room!
If you want to use a Phone in any/all of the other rooms, then you have two choices-
a) Also have a Splitter with each active/plugged-in Phone
b1) Move the remaining "other room" lines at the Patch Panel end, in to your Item 2, Telephone Socket, on the assumption that it is already filtered.
If it is NOT filtered, then add a Splitter in, only one should be necessary, covering all of those "remaining other room" extensions..
b2) Could also be achieved by running (if needed) a separate cable from the BT Faceplate to the "remaining other rooms" connections on the Patch Panel.
The important thing to remember is that VDSL/ADSL connections ARE NOT FILTERED.
Edited by eckiedoo (Sun 12-Oct-14 10:21:28)