Teltone m-392 Guida Utente
Calling Party Supervision
The U.S. telephone network typically uses Calling Party Supervision. This means that
even though the called party hangs up, they may be reconnected to the calling party
when their phone is taken off-hook again. The calling party must hang up in order for the
called party to be fully disconnected and initiate a new call. The telephone network will
time out and automatically disconnect the call within 5 - 20 seconds, depending on
network design. This will allow the called party to get dial tone when they go off-hook
again.
even though the called party hangs up, they may be reconnected to the calling party
when their phone is taken off-hook again. The calling party must hang up in order for the
called party to be fully disconnected and initiate a new call. The telephone network will
time out and automatically disconnect the call within 5 - 20 seconds, depending on
network design. This will allow the called party to get dial tone when they go off-hook
again.
To circumvent this problem, when the LSS senses a priority interrupt it immediately
signals the Polling Controller to disconnect the original polling call. This procedure
ensures that the user initiating the priority will have access to network dial tone to
complete the priority call. If for any reason the interrupted call cannot be properly
terminated within approximately 5 seconds, a line busy tone is returned to the priority
caller. The caller should then hang up for a few seconds before trying the call again.
signals the Polling Controller to disconnect the original polling call. This procedure
ensures that the user initiating the priority will have access to network dial tone to
complete the priority call. If for any reason the interrupted call cannot be properly
terminated within approximately 5 seconds, a line busy tone is returned to the priority
caller. The caller should then hang up for a few seconds before trying the call again.
Outgoing Calls from the LSS
The LSS allows DTMF and rotary dialing on outgoing calls.
Telephone Calls—Modem or Other Device Idle:
When the LSS is idle, local telephones are connected to a local battery feed. When a
phone goes off-hook, it is switched to the central office line to obtain dial tone. When the
phone goes on-hook, the line is switched back to a local battery feed.
phone goes off-hook, it is switched to the central office line to obtain dial tone. When the
phone goes on-hook, the line is switched back to a local battery feed.
Telephone Calls—Modem Active:
If in Total Priority Mode, and the modem is active, a priority port going off-hook remains
connected to the local battery feed while the LSS disengages the active port. To do this,
the LSS forces the modem on-hook (terminating the modem carrier), then sends a
disconnect command to the Polling Controller and receives acknowledgment that the
Polling Controller has gone on-hook, then goes on-hook towards the central office to
obtain a new dial tone for the calling party.
connected to the local battery feed while the LSS disengages the active port. To do this,
the LSS forces the modem on-hook (terminating the modem carrier), then sends a
disconnect command to the Polling Controller and receives acknowledgment that the
Polling Controller has gone on-hook, then goes on-hook towards the central office to
obtain a new dial tone for the calling party.
If in Emergency Priority Mode, and the telephone at Port 1 goes off-hook , it receives
dial tone (generated internally by the LSS). Dialed digits are monitored. If the dialed
phone number does not match the allowed numbers, the existing connection through the
LSS is not interrupted and busy tone is returned to the telephone user. If, however, the
dialed number matches a programmed emergency phone number, data transfer is halted
and the line made free for the telephone user. The LSS then dials the number and
connects you to the central office line. If you enter the special Access Code, the LSS will
connect you to the central office line; when you receive dial tone, dial any number.
dial tone (generated internally by the LSS). Dialed digits are monitored. If the dialed
phone number does not match the allowed numbers, the existing connection through the
LSS is not interrupted and busy tone is returned to the telephone user. If, however, the
dialed number matches a programmed emergency phone number, data transfer is halted
and the line made free for the telephone user. The LSS then dials the number and
connects you to the central office line. If you enter the special Access Code, the LSS will
connect you to the central office line; when you receive dial tone, dial any number.
Caution:
If the LSS is receiving an incoming fax when you go off-hook in either Total
Priority Mode or Emergency Priority Mode, the LSS will be unable to obtain network dial
tone until the sending fax disconnects or the PSTN times out (usually within 10-15
seconds).
tone until the sending fax disconnects or the PSTN times out (usually within 10-15
seconds).
If in No Priority Mode, the modem or other device remains active and the line is not
assigned to another port.
assigned to another port.
If the LSS receives no response from the Polling Controller after three disconnect
commands are transmitted, the LSS goes on-hook toward the central office for several
seconds to obtain a new dial tone for the calling party. Privacy timeout will not be invoked
unless enabled by the user. Read the Privacy Timeout section later in this chapter for
more details.
commands are transmitted, the LSS goes on-hook toward the central office for several
seconds to obtain a new dial tone for the calling party. Privacy timeout will not be invoked
unless enabled by the user. Read the Privacy Timeout section later in this chapter for
more details.
Line Sharing Switch
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