Based on below image from the manual, Digirig audio cable will look like this:
RJ-45 pin 3 (GND) → 3.5mm TRRS sleeve (GND)
RJ-45 pin 4 (PTT) → 3.5mm TRRS ring 2 (RIG_PTT)
RJ-45 pin 5 (GND) → 3.5mm TRRS sleeve (GND)
RJ-45 pin 6 (MIC) → 3.5mm TRRS ring 1 (RIG_AFIN)
3.5mm TRS tip (SPK) → 3.5mm TRRS tip (RIG_AFOUT)
Different sources use different directions for pin numbering on RJ-45
Refer to picture, this is the socket view on the transceiver.