You can use the SAILOR 6209 Accessory Connection Box to combine DSC modem and the SAILOR 6201 Handset option MPN: 406201A-00500.

Compatible with SAILOR 6200 and SAILOR 6300 Series.

For those who prefer a traditional handset or wish to connect additional handsets to the VHF or MF/HF
SAILOR 6201 Handset Fits units listed below:
SAILOR 6222 VHF DSC Class A
SAILOR 6248 VHF
SAILOR 6249 VHF Survival Craft
SAILOR 6310 MF/HF 150W DSC Class A
SAILOR 6311 MF/HF 150W DSC Class A - FCC
SAILOR 6320 MF/HF 250W DSC Class A
SAILOR 6350 MF/HF 500W DSC Class A