Do you want to do it through terminal TTY? If so, You can programm:
cls FNA
ftr fdn 7000
RCO X
X= You can programm RCO cycle to forward when no answer after 1 ring
to chang the RCO 0,1 or 2
in ld 15
reg chg
type RDR
OPT CFF CFRA DSTD PVCD CWRA MCI
FNAD FDN
FNAT FDN
FNAL FDN
CFTA YES
CCFWDN
CFN0 4 ---> cycles for RCO 0
CFN1 1 ---> cycles for RCO 1
CFN2 4 ---> cycles for RCO 2