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Fax server does not handshake when receiving an Anonymous

Discussion in '3CX Phone System - General' started by coreybrett, Nov 2, 2010.

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  1. coreybrett

    Apr 12, 2010
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    My 3CX fax server does not initiate handshake when receiving a call from an Anonymous caller (caller ID blocked).

    I have several DIDs pointing to different extensions for faxing purposes.

    So for example I have 16173998217 set to “Send fax to” “email of extension 221 Corey Boyle”

    This works great as long as the incoming fax is sent from a line that does not have caller ID blocked.

    If the caller ID is blocked, the fax server answers the line, but never gives tones.

    I can confirm this with my iPhone by switching “show my caller ID” on and off.
    If I call with “show my caller ID” set to “on” I hear the tones.
    If I call with “show my caller ID” set to “off” I do not hear the tones.

    Any help would be appreciated, as this causes quite an issue for me and my users. A surprising number of faxes are sent from lines with caller ID blocked.

    I have attached a portion of my server log.
    You can see an anonymous call at 09:57:15.266 and a normal call at 09:57:48.534.

    Attached Files:

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