It is possible to connect the GSM modem to the RouterOS device and use it to send and receive SMS messages. RouterOS lists such modem as a serial port that appears in the '/port print' listing. GSM standard defines AT commands for sending SMS messages and defines how messages should be encoded in these commands.

'advanced tools package provides command '/tool sms send' that uses standard GSM AT commands to send SMS.


/tool sms send


Sending command for ppp interface:

/tool sms send usb3 "20000000" \ message="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz!@#\$%^&*(){}[]\"'~"

For LTE interface use LTE interface name in the port field:

/tool sms send lte1 "20000000" \ message="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz!@#\$%^&*(){}[]\"'~"
port (string)Name of port from /port list that GSM modem is attached to.
phone-number (string)Recepient phone number. Allowed characters are "0123456789*#abc". If first character is "+" then phone number type is set to international, otherwise it is set to unknown.
channel (integer)Which modem channel to use for sending.
message (string)Message contents. It is encoded using GSM 7 encoding (UCS2 currently is not supported), so message length is limited to 160 characters (characters ^{}\[]~
smsc (string)
type (string)If set to class-0, then send class 0 SMS message. It is displayed immedeately and not stored in phone.
sms-storage (string)
Select storage where to save received SMS (modem/sim) 

USSD messages

USSD (Unstructured Supplementary Service Data) messages can be used to communicate with mobile network provider to receive additional information, enabling additional services or adding funds to prepaid cards. USSD messages can be processed by using AT commands (commands can differ or even may be blocked on some modems).

3G or GSM network modes must be activated to use this functionality, as it's not supported under LTE only mode (R11e-LTE modem auto switches to 3G mode to send out USSD message).

PDU (Protocol Data Unit) message and its decrypted version is printed under LTE debug logging.


Check if LTE debug logging is active:

/system logging print
Flags: X - disabled, I - invalid, * - default 
0 * info memory 
1 * error memory 
2 * warning memory 
3 * critical echo 

If there is no logging entry add it by running this command:

/system logging add topics=lte,!raw

/system logging print
Flags: X - disabled, I - invalid, * - default 
0 * info memory 
1 * error memory 
2 * warning memory 
3 * critical echo 
4 lte,!raw memory 

To recieve account status from *245#

/interface lte at-chat lte1 input="AT+CUSD=1,\"*245#\",15"
output: OK
/log print
11:51:20 lte,async lte1: sent AT+CUSD=1,"*245#",15 
11:51:20 lte,async lte1: rcvd OK 
11:51:23 lte,async,event +CUSD: 0,"EBB79B1E0685E9ECF4BADE9E03", 0 
11:51:23 gsm,info USSD: konta atlikums


Since v3.24 RouterOS also supports receiving of SMS messages, and can execute scripts, and even respond to the sender.

Before router can receive SMS, relevant configuration is required in general /tool sms menu. Following parameters are configurable:

allowed-number (string; Default: "")Sender number that will be allowed to run commands, must specify country code ie. +371XXXXXXX
channel (integer; Default: 0)Which modem channel to use for receiving.
keep-max-sms (integer; Default: 0)Maximum number of messages that will be saved. If you set this bigger than SIM supports, new messages will not be received! Replaced with auto-erase parameter starting from RouterOS v6.44.6
auto-erase (yes | no; Default: no)SIM storage size is read automatically. When auto-erase=no new SMS will not be received if storage is full. Set auto-erase=yes to delete the oldest received SMS to free space for new ones automatically. Available starting from v6.44.6
port (string; Default: (unknown))Modem port (modem can be used only by one process "/port> print" )
receive-enabled (yes | no; Default: no)Must be turned on to receive messages
secret (string; Default: "")the secret password, mandatory

Basic Example configuration to be able to view received messages:

/tool sms set receive-enabled=yes port=lte1

           status: running
  receive-enabled: yes
             port: lte1
          channel: 0
       auto-erase: no


/tool sms inbox

If you have enabled the reader, you will see incoming messages in this submenu:

Read-only properties:

phone (string)Senders phone number.
message (string)Message body
timestamp (time)Time when message was received. It is the time sent by operator, not the router's local time.
type (string)Message type


 :cmd SECRET script NAME [[ VAR[=VAL] ] ... ]
  • SECRET - the password
  • NAME - name of the script that's available in "/system script"
  • VAR - variables that will be passed to the script (can be passed as VAR or as VAR=value), separated by spaces.

Other things to remember:

  • *Parameters can be put into quotes "VAR"="VAL" if necessary.
  • *Escaping of values is not supported (VAR="\"").
  • *Combined SMS are not supported, every SMS will be treated separately
  • * 16Bit unicode messages are not supported
  • * SMS are decoded with the standard GSM7 alphabet, so you can't send in other encodings, otherwise it will be decoded incorrectly



:cmd script mans_skripts
:cmd slepens script mans skripts
:cmd slepens script mans_skripts var=
:cmd slepens script mans_skripts var= a
:cmd slepens script mans_skripts var=a a


:cmd slepens script mans_skripts
:cmd slepens script "mans skripts"
:cmd slepens script mans_skripts var
:cmd slepens script mans_skripts var=a
:cmd slepens script mans_skripts var="a a" 


/tool sms send command is logging data that is written and read. It is logged with tags gsm,debug,write and gsm,debug,read For more information see system logging.

Implementation details

AT+CMGS and AT+CMGF commands are used. Port is acquired for the duration of the command and cannot be used concurently by another RouterOS component. Message sending process can take a long time, it times out after a minute and after two seconds during initial AT command exchange.

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