Called Subscriber Identification
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The Called Subscriber Identification (CSID) is a string that identifies a fax as a recipient. It's sent by a fax machine when receiving a fax from a transmitting machine. The CSID is displayed on the sending fax machine, this helps to confirm that the fax is being sent to the correct recipient. This string is usually a combination of the fax or telephone number and the name of the sender and is often the same as the Transmitting Subscriber Identification (TSID).
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.
