Security Checking
The T-311 has the capability to provide incoming call security by requiring the caller to enter a
multi-digit DTMF password after the T-311 answers the call and issues a connection tone (941 Hz for
1 second).
Note:
The T-311 will always issue the connection tone when the password requirement is enabled
(*C=1) or if Bit 3 of the S*2 register is set to 1. In this situation, if a second T-311 is the caller, that
T-311 will detect the connection tone and issue the message “T-311 CONNECT” (when V is set to
V3) to its computer port.
To enable security checking: Issue the command AT*C1<CR>
If you want computer display messages PASS and FAIL in addition to the tones, enter the default set-
ting: ATV3<CR>
Note:
Security code checking requires that DTMF detection also be enabled. To do this, enter:
ATXB<CR>
(default) You must also set a password. If no password is set and security checking
is enabled, no caller will be able to access the T-311.
To set the password
Issue the command: AT*Wn...n#<CR>
The T-311 responds to a correct password entry with a single tone and an incorrect entry with three
tones. For more information on how the T-311 handles calls with passwords enabled, see Chapter 6
(Calling the T-311.)
Transferring Calls
A T-311 operating behind a PBX can transfer calls to another PBX station.
Flash the line
A transfer is initiated by “flashing” the line on an established call. To do this, issue the command
ATD!<CR>
If the flash is successful, the T-311 returns the message: FLASH
If the flash is unsuccessful (e.g. because an auxiliary telephone sharing the line with the T-311 is
off-hook), the T-311 returns the message (if M is set to M2): FLASH FAILURE and the original con-
nection is maintained.
Dial the number
After the line is flashed, dial the other PBX station: ATDn..n<CR>
Disconnect after answer
When the called party answers, hang-up the call with the command: ATH<CR>
T-311
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