I have bought an intercom (cheap no-name) which I want to install in our house. It consists of one base station which has a 9v battery and an on/off switch as well as the monitor/call button. The other unit is passive (no battery) with only the monitor/call button. There is a supplied 20m cable to connect the two, with a 3.5mm jack (tip and sleeve). However I don't want to use this cable because I don't want to break open my walls again- that was already done not long ago, and at the time I installed plenty of cat6. So at last my question: is it possible/viable/safe to run this intercom system using my existing cat6 cables? I was planning to solder/splice up a pair of cat6-3.5mm jack adaptors or perhaps even change the socket on the units to be cat6. Supplementary question: if it is possible/viable/safe, does it matter how I connect it? I was thinking something along the lines of all solid colour cat6 strands to the 3.5mm tip, all white striped strands to the sleeve.

I used to have 2 Verizon landlines (main residential and a second line for work). I replaced the work line with cable voice system but kept the Verizon resi landline (reliable during extended power outages in our rural area). The work line is located close to the cable modem so easily set up. Now I want to move the work line location and thought I could connect the cable voice to my home wiring so as to access it from an existing wall jack. I've researched the steps online but am new to this and have run into some confusing issues. Some (or all) of the following may be incorrect including my terminology. I do not have an external NID (there is a box outside but I see no customer access section) but have the setup shown in the attached pictures. The top box is an alarm system, next is a Network Interface with a modular jack connecting it to an entrance bridge. One picture shows the wiring in an existing wall jack. The top jack has no dial tone and the bottom jack carries home Verizon line. (Unconnected blue/white blue wires have exposed copper and I assume should be taped off). I believe I need to disconnect my home wiring from the telephone company first. Since I want to keep my existing land line, I assume this means I must disconnect the green/white green wires on my entrance bridge as these match the top connection on the wall jack (no dial tone). Then simply connect my cable modem to the matching wall jack. However, I unplugged the modular jack from the Network Interface assuming it would cut off my landline dial tone but that didn't happen. I plugged a working phone into the Network Interface but had no dial tone. Also, the yellow/black wires are not connected to the bridge. The orange/white orange wires are butt plugged to red/blue wires. (Orange wiring is connected to the bottom wall jack). Am completely confused and not sure how to figure out what I should do. Any suggestions?