Rover MF modem register:
Factory Sregisters
S21=200  S22=000  S23=001  S24=100  S25=150  S26=027  S27=028
S28=000  S29=000  S30=008  S31=004  S32=102  S33=000  S34=005
S35=000  S36=-001  S37=000  S38=000  S39=000  S40=000  S41=107

root@mvc-rover:~/control# echo -ne "ats?\r" > /dev/modem
root@mvc-rover:~/control#
Local Sregisters
S00=056  S01=000  S02=000  S03=002  S04=003  S05=000  S06=008
S07=015  S08=060  S09=000  S10=010  S11=000  S12=002  S13=000
S14=001  S15=001  S16=000  S17=001  S18=003  S19=000  S20=000


Rover LF Modem Registers
Local Sregisters
S00=069  S01=000  S02=000  S03=002  S04=002  S05=000  S06=008
S07=015  S08=060  S09=000  S10=010  S11=000  S12=000  S13=000
S14=002  S15=001  S16=000  S17=001  S18=000  S19=000  S20=000

root@mvc-rover:~/device# echo -ne "ats22?\r" > /dev/lfmodem
root@mvc-rover:~/device#
Factory Sregisters
S21=200  S22=000  S23=001  S24=056  S25=150  S26=027  S27=028
S28=003  S29=000  S30=020  S31=004  S32=102  S33=000  S34=005
S35=000  S36=-001  S37=000  S38=000  S39=000  S40=000  S41=629