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COMSPHERE 3800Plus Modems
11-2 November 1996 3980-A2-GB30-20
Originate Access Security
Originate
Access lets you control who can originate a
call from a local modem via the A
T command set. This is
useful in LAN and modem pooling applications. With
Originate Access security
, a local user
’
s password is
embedded in the A
T dial command. If the password is
valid, the user can dial out using this modem.
The following example illustrates the format for an
Originate Access password:
ATD%abc123%T9,8005551234 (press Enter)
Where: A
TD
is the A
T dial command string.
% (percent sign) is the start and stop
AT command string interrupt character.
The password must be embedded in
these characters.
abc123 is the 10-alphanumeric character
originate password.
T is the Tone (DTMF) dial modifier.
, (comma) is the pause dial modifier.
98005551234 is the phone number.
Originate Access Security is enabled or disabled by the
Set Originate Security group.
Answer Access Security
The other method of security, which is the primary
focus of this chapter
, is Answer Access. Answer Access
allows the answering modem to restrict entry to the host
DTE by ensuring that originating (remote) modems and/or
users have been granted proper security access. Access
can be granted by using one of three techniques: VF-side
password entry
, DTE-side password entry, or a
combination of both.
VF-Side Passwords
VF-side password entry occurs between modems prior
to connecting. Once the VF-side password is entered, no
other user intervention is required since security
negotiation is handled solely by the modems. When the
answering modem is configured for VF entry technique, it
goes of
f-hook and transmits to the originating modem
either a secondary dial tone or silence (this choice
depends on how the VF Prompt T
ype option is
configured). The originating modem detects this response
and transmits its password which corresponds to a
preselected series of DTMF tones. Note that VF
passwords can be from 1 to 8 digits in length; only
decimal digits are permitted. The answering modem
verifies the password against its own password database,
and if valid, continues with the normal training sequence.
VF-side password works with any autodialer that
supports second dial tone or quiet answer and can be
implemented in one of three ways. First, the VF password
can be embedded within the A
T command dial
string. Second, a phone number and password can be
entered via the diagnostic control panel (DCP). (This is
the preferred method for synchronous applications.) And
finally
, an attached telephone can be used to manually
generate DTMF tones for the phone number and
password. After the answering modem accepts the
password and generates an answerback tone, the
originating caller places the modem in Data mode and
hangs up the phone.
The following examples illustrate two ways to enter a
VF-side password:
ATDP5551234TW12345678# (press Enter)
or
ATDT5551234@12345678# (press Enter)
Where: ATD
is the A
T dial command.
P
and
T are the Pulse dial and Tone
(DTMF) dial modifiers.
5551234 is the phone number.
W or @ is the VF Prompt Tone option
setting for second dial tone or quiet
answer.
12345678
is the VF-side password.
# is the password termination character.