Read TSID From Incoming Fax

Discussion in '3CX Phone System - General' started by joebocop, Dec 14, 2015.

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  1. joebocop

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    We have a Patton SN4112 over which our company receives faxes over a PSTN line (FXO interface). The SN4112 passes the session to 3CX, which routes the incoming fax to an analog fax machine, itself registered with 3cx via a Patton SN4112 FXS device.

    The fax machines seems to receive a "TSID" from the sender, and prints it (the phone number) atop each inbound fax.

    I am wondering if 3CX is able to read or detect that inbound TSID. We would like 3CX to perform some logic on the incoming call, based on the TSID value.

    Thanks!
     
  2. leejor

    leejor Well-Known Member

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    3CX can normally do call forwarding based on CID, but, the fact that this is a fax, may "override" that option, if it is even shown as available.
     
  3. joebocop

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    As always, leejor, thank you for weighing-in.

    In this situation, the PSTN line doesn't actually have CID enabled on it, so all inbound calls appear to the Patton device as emanating from "Anonymous". Interestingly, however, the receiving fax machine still prints the correct "caller id" information at the top of each incoming fax page. We did some digging, and discovered that this data arrives to the fax machine as part of the fax protocol. I wondered if 3CX had any access "inside" the fax session, to grab that TSID info.

    Also, the receiving analog fax machine is itself connected to a Patton SN4112 FXS device, and a full debug of an incoming fax session thereupon reveals no "caller id" or TSID info, so it must truly only be exposed, decoded, whatever, at the ultimate destination.
     
  4. leejor

    leejor Well-Known Member

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    I wouldn't expect that 3CX had any access to the data "inside" the fax stream, and as you suspect, the caller information that shows the originator, is embedded in the fax data. Some Fax machines may make use of CID as well, but as most people programme the originating information (name and number) into their machines, it's much more consistent for the receiving machine to display that info.
     
  5. joebocop

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    Yess, it looks like adding Caller ID to our PSTN line is the best way to have 3cx do logic on the inbound stream. Thanks!
     
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