[Freeswitch-users] Fax / voice splitting question

Hello all , Please could someone share if its possible to split voice and fax calls, e.g. numbers that are used to also receive fax¹s 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