Hello there,
Good day. Thank you for the question.
For new authorized numbers, you may refer here https://wiki.teltonika-gps.com/view/FMB920_Parameter_list#SMS.2FCall_settings
Also attaching an image from the parameter list for your perusal.

So if you would like to add a new list of numbers in the authorized list then you may do as follows:
With SMS login and Password :- <SMS login><space><SMS password><space>setparam 4000:new mobile1 number;4001:new mobile2 number
Without SMS login and Password :- <space><space>setparam 4000:new mobile1 number;4001:new mobile2 number
Please go through this and let me know if it helps.
Kind regards.