User`s guide

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Using X.25
Remote access to your unit may also be carried out over an X.25 connection. The remote
unit must first have the parameter Allow CLI access from X.25 address set to an
appropriate value (see Configuration - System > General). If the unit then receives an
incoming X.25 call where the trailing digits of the NUA match the specified sub-address, the
calling user will receive the standard login prompt. On entry of a valid username and
password, they will be given access to the command line as if they were connected locally.