Sender Control List (SCL) settings

The SCL allows you to select the addresses (or phone numbers) from which SMS messages will be accepted. This is in effect a “Caller ID” capability in which the Digi device screens message senders and either processes or discards the message according to the configured SCL rules.

Following are descriptions of the SCL-related settings for the SMS feature.

• Enable SMS Sender Control List: Enable the SCL capabilities on this Digi device. When you enable this option, you can configure the remaining SCL-specific SMS options. This option is disabled (off) by default.
• Send NAK reply via SMS if received message is rejected by SCL: Sends a negative acknowledgment (NAK) message via SMS to the originator of the command message indicating that the original message was rejected due to the configured SCL rules. This occurs when the Digi device receives a message via SMS from a sender who was blocked by the SCL rules. This option is disabled (off) by default.

For each SCL rule, you can configure the following options:

• Enable: Enables the rule for use by SMS. You can enable and disable rules without removing them from the SCL. Digi device ignores disabled rules when examining received messages.
• Sender Address (Phone Number): The address (phone number) of the sender for which this rule applies. If the sender's address matches this configured address, the Digi device accepts the SMS message for further processing. If the sender's address does not match any of the enabled SCL rule addresses, the Digi device rejects it and no further processing is performed. To remove the address, simply clear the address field on the settings page.
• Match Type: Specifies the type of address match test to perform for this rule. The supported match types are as follows:
  • Exact: The sender's address must exactly match the address configured for this rule.
  • Right: The sender's address must match the address configured for this rule when comparing the rightmost characters to the shorter of the two strings (sender address, rule address). For example, “5551212” matches “13125551212” since the rightmost characters match to the length of the shorter string, “5551212”. This is the default match type.
  • Left: The sender's address must match the address configured for this rule when comparing the leftmost characters to the shorter of the two strings (sender address, rule address). For example, “1312555” matches “13125551212” since the leftmost characters match to the length of the shorter string, “1312555”.
  • Partial: The sender's address must match the address configured for this rule when comparing the consecutive characters to the shorter of the two strings (sender address, rule address). For example, “312555” matches “13125551212” since the shorter string “312555” is a substring of the longer string “13125551212”.