Calls involving a pstn gateway – Allied Telesis AT-VP504E FXS (H.323) User Manual
Page 12
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Chapter 1 - Making Calls with the AT-VP504E FXS
User’s Manual (H.323 Version)
AT-VP504E FXS
8
Calls Involving a PSTN Gateway
The following example illustrates how a telephone/fax connected to an
AT-VP504E FXS terminal and a PSTN phone can communicate via a
PSTN gateway.
Phone/Fax -> AT-VP504E FXS -> AT-VP504E FXO (Gateway) ->
PSTN
A user makes a call with the phone/fax connected to an AT-VP504E FXS,
which in turn contacts an AT-VP504E FXO gateway, then reaches the
corresponding PSTN Phone.
A PSTN user can also contact the AT-VP504E FXO gateway, which in
turn contacts the AT-VP504E FXS, then reaches the corresponding phone/
fax.
IP / LAN
Telephone
AT-VP504E FXS
Fax
Gatekeeper
PSTN Phone
PSTN
4 telephone lines
connected to the PSTN
AT-VP504E FXO
(Gateway)
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