Call Subscriber ID
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Most fax machines transmit a Call Subscriber ID (CSID) calling string with the faxes they send. The CSID value can be programmed into the fax machine or entered into a field from the fax software. This subscriber ID is intended to label the specific fax machine, but you can use the string to support different methods of automatic routing.
For CSID routing, the fax software builds a table that associates CSID strings to network nodes or e-mail addresses. The software captures the string, then routes the fax to the associated network station or sends the fax via e-mail. The table can also associate a group of recipients to a single CSID.