Hello Karan,
Good day. Thank you for your question.
The Parameter ID to add numbers in the Authorized Numbers section is from 4000 to 4199. For future reference, you may point the mouse cursor to the specific parameter in the Configurator and find the Parameter ID, as below:
The SMS command to set a parameter is setparam. For more information on the SMS/GPRS command list, refer here - https://wiki.teltonika-gps.com/view/FMB120_SMS/GPRS_Commands
Therefore, the SMS structure will be as follows:
With login and password : <login><space><password><space>setparam 4000:phone number with country code
Without login and password : <space><space>setparam 4000:phone number with country code
If you are sending via GPRS then you may skip the login, password, and <space>.
Please try this out and let me know if it helps.
Kind regards.
