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External Call Origination
When the telephone set on a remote Express 5200 is taken off-hook,
the local Express 5200 generates dial tone and waits for an
extension to be entered by the user. Once the extension is entered,
the remote Express 5200 transmits this information to the host
Express 5200, where it is compared to extension information in the
extension/DLCI table. If the extension is not located, the host
assumes the number is external and attempts to seize an available
port and dial the extension on the PBX. If no port is available, a
trunk busy (fast busy) is returned to the remote port. After the
extension is dialed, the data link is established and the call remains
up until the remote Express 5200 terminates the call.
External Call Reception
When an incoming call is received from the PBX, the remote
Express 5200 auto-answers the call and generates a dial tone. At
this point, the calling party can dial the extension of the party they
are trying to reach. The host looks up the extension in the
extension/DLCI table and routes the call appropriately. If the
extension does not exist, the Express 5200 generates a trunk busy
signal back into the PBX. Otherwise, the host routes the call to the
appropriate port. When the remote party answers the call, the data
link is established and the call remains up until the remote
Express 5200 hangs up or until a loss of line current is detected on
the FXO port.
Internal Calls
When the telephone set on a remote Express 5200 is taken off-hook,
the remote Express 5200 generates a dial tone and waits for the
extension to be entered. Once the extension is entered, the remote
Express 5200 transmits this information to the host Express 5200,
where it is compared to extension information in the extension/
DLCI table. If the extension is found in the extension/DLCI table,
the call is routed to the appropriate extension via the host unit.
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Express 5200 User Manual
Chapter 4. Applications
4-13
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