Related articles:
Telephone
Telephone exchange
Landline
Telephone number
North American Numbering Plan
Signaling System 7
Circuit switching
Digital Signal 1
Mobile phone
Key terms:
switch
calls
pstn
telephone
connected
exchange
dialing
codes
operator
hierarchy
tandem
trunk
handle
locations
routing
automated
signaling
busy
std
long distance
customer
toll center
subscriber
north american
wired
multiplexed
local exchange
end office
telecommunications
switch hierarchy
regional centers
telephone exchanges
interconnect
dial tone
long lines
primary center
bell canada
divestiture
reference point
more advanced
nearby switch
access network
sectional center
french telephone
centre de transit
operations center
circuit switching
connected together
public switched telephone network
telephone switch hierarchy
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