Appreciate the url form both Brian & Don, I had found this on Confluence,  but I read it as more about how to detect a fax and send it to fax extension – that I get. Hence am I thus to understand that the logic would be if not triggering this transfer to the fax extension;  to let it “fall through” to the next action and send it to a normal user extension? 

Assuming correct, is the voice caller experience acceptable in terms of timing for a human (impatient as ever)? Roughly whats the minimum time needed to detect a remote fax? Can ring back be played out in parallel to the fax detection stage ? I will try myself but I do not yet have the fax machines to experiment with, hence asking for advice. 
Thanks

From: <freeswitch-users-bounces@lists.freeswitch.org> on behalf of Brian West <brian@freeswitch.org>
Reply-To: FreeSWITCH Users Help <freeswitch-users@lists.freeswitch.org>
Date: Tuesday, 20 September 2016 at 23:00
To: FreeSWITCH Users Help <freeswitch-users@lists.freeswitch.org>
Subject: Re: [Freeswitch-users] Fax / voice splitting question

https://freeswitch.org/confluence/display/FREESWITCH/mod_dptools%3A+fax+detect

On Tue, Sep 20, 2016 at 4:34 PM, Magnus Kelly <magnus.kelly@gmail.com> wrote:
Hello all ,

Please could someone share if its possible to split voice and fax calls, e.g. numbers that are used to also receive fax’s to be forwarded by SIP to FreeSwitch in order to answer calls and then somehow automatically determine between voice and fax calls and onward route to either fax extension or to a hunt group to find a person? I was thinking of looking for T.38 in the SDP, but then understood that this only appears in the actual fax transaction and thus bit late in the setup to determine routing.

Appreciate any tips if others have successfully found solutions to this call case.

Thanks
Magnus

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