Zoom X5v Technical Reference page 53

Note: If you have a wireless network that operates over the typical
2.4GHz frequency and you want to use cordless phones, it is best if
you use 900MHz or 5GHz phones; that way, you will minimize any
chance of interference.
Install the X5v or V3 Where Your Phone Line
Enters Your Home (USA Only)
In many homes, there is a telephone jack where the phone line
enters the house. This box is called the "demarcation point." It
marks the point where the phone company's wiring ends and your
wiring begins. This is an excellent place to install your X5v or V3
and connect it so that it provides VoIP capability to all the phones
in your home.
There is a catch. To use the DSL line, you need to connect your
X5v or V3 gateway to the demarcation point's jack and to either a
wired or wireless network. If you have a wired network, you simply
run a network cable to the gateway as you would in a typical
installation scenario. If you don't have a wired network, plugging
the gateway into an 802.11 wireless access point is a fast,
inexpensive, and convenient way to deliver your DSL connection
to one or more computers without running wires.
To connect your phones, follow these steps:
1 1 1 1
Disconnect the modular plug at the demarcation point and
plug it into the X5v or V3's jack marked PHONE.
2 2 2 2
Then connect one end of the phone cord that came with the
X5v or V3 into its DSL jack and the other end into the jack on
the demarcation point.
(If the demarcation point doesn't have a modular plug, you will
need to unwrap the wire that is providing the connection. Trim
this wire and add an RJ-11 connector to it before you plug it
into the X5v or V3's PHONE jack.
Similarly, you will need to cut off the RJ-11 connector from
the phone cord you use to connect the X5v or V3 DSL jack to
the demarcation point. Strip the two middle wires and insert
them where the original phone line was connected in the
demarcation box.)
3 3 3 3
With the computer's power off, check that your phones work
normally.
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