Zoom ADSL X6v Manuel d'utilisateur Page 59

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Chapter 4: Setting Up VoIP Service
59
Bridging from VoIP to PSTN
The VoIP bridge modes let you use the X6v as a mini telephone
switch. You are probably familiar with telephone switches at
companies, government offices and the like. When you call a main
number, the telephone switch (or switchboard) answers, and you
can typically dial any extension you want inside the office.
When you make a VoIP call to the X6v in VoIP to PSTN bridge
mode, you are connected to the landline that is plugged into the
X6v. This is like being connected to a switchboard when you call a
company or government office. Unlike the case of a company or
government office switchboard, however, you are not limited to
dialing extensions within the office. You can dial any call that the
PSTN line supports.
This can be useful and convenient if people you know or work
with have a way to make free or low cost VoIP calls to your X6v. If
they can do this, then they can make PSTN calls from your X6v.
Often this will save considerable amounts of money relative to
making the call directly.
Suppose you are in Los Angeles, and you have a friend in
Hong Kong who needs to make frequent calls to local
numbers in L.A. Your friend can make free or very low
cost VoIP calls to your X6v. Once she has connected to
your X6v, she can make local PSTN calls from your X6v
to anywhere in L.A.
Suppose your company has offices in L.A. and in
Frankfurt. You can sign up for a VoIP number that is local
to Frankfurt. Now when colleagues in Frankfurt want to
call local numbers in L.A., they can do so for the price of a
local call in Frankfurt: they can call the local Frankfurt
number that is assigned to your X6v, and when they
connect to your X6v in bridge mode, they can dial local
PSTN calls to anywhere in L.A.
Some cell or mobile phone plans offer free or reduced rate
calling to particular numbers. If you designate your X6v’s
VoIP number under such a plan, then you can make calls
under that plan from your cell phone to your X6v. Once
you connect to the X6v, you can make a bridge call to
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