Home : What sets the fax TSID and CSID?
Q10072 - INFO: What sets the fax TSID and CSID?

The information in this article applies to:

  • All current fax drivers


The fax ID is set by various methods, and from various places.


The ID that is sent by a fax sender is known as the TSID. The ID that is presented by a fax recipient is knows as the CSID.

For all current Passport fax drivers, the TSID content is always set from the id_string entry of the btcall.cfg configuration file.

The CSID content may come from several places depending on the type of driver and the configuration. For certain special configurations involving DTMF access, the CSID is created from the calling user's ID and that user's specific sequence number, but these configurations are not common.  Another uncommon setting that can be specified in the fax syscon is to answer with the assigned 'R' number, followed by a constant syscon-specified string. Otherwise, for the TR-114/Trufax drivers (for Brooktrout API 3.7-4.3), the CSID will also be set from the id_string entry of the btcall.cfg file, and will therefore be the same as the TSID.

For all TR1034 drivers, and for the fax service, except for the first two options described above, the CSID will by default be set from the Fax ID field, which is set as part of the Banner Info, in the fax syscon. However, it is possible that if the country_code setting in the btcall.cfg file is set to certain country settings, then the CSID will not be permitted to be overridden, and will be set only by the id_string setting. Note that the default country_code (USA) does permit the override. In any case, for all TR1034 drivers and services, the TSID is set from the id_string.

The banner info of the fax syscon, except as noted above, is used only in the formatting of the standard fax banner line.

Last Reviewed: 2008.01.17

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Created on 1/17/2008.
Last Modified on 6/12/2008.
Last Modified by Robert Klueh.
Skill Level: Intermediate.
Article has been viewed 5383 times.
Rated 5 out of 10 based on 12 votes.
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