Tunnel – DUAL SIM configuration parameters: “DUALSIM_”

The parameters with a DUALSIM_ prefix are those related to the MTX-Tunnel configurations installed in MTX modem models that have the DUALSIM feature. The fact of having dual SIM in the modem has the following advantages depending on the modem model:

• It is not mandatory to use two SIMs. Only a single SIM card slot can be used. In some modems, such as the MTX-IOT-S family, it allows choosing between an external SIM slot (easily accessible from outside the modem) or an internal SIM slot, where to access the SIM it is necessary to open the modem housing , making it difficult for third parties to access
• It is possible to use 2 simultaneous SIMs. The MTX-Tunnel in this case allows you to change from one to another in the event of a fall of one of these, which provides greater security against falls of a certain telephone operator or even due to the deterioration of a SIM card.

DUALSIM_select

Description: This parameter allows you to specify which SIMs to use. That is, if only the main SIM, the secondary SIM, and both SIMs must be used, in the latter case it is possible to specify which of the two SIMs is the first to be used after the modem has been reset.

Possible values:

• sim: uses only the main SIM of the modem (associated with the parameters GPRS_apn, GPRS_login, GPRS_password y GPRS_dns)
  sim2: use only the secondary SIM of the modem (associated with the parameters GPRS_apn2, GPRS_login2, GPRS_password2 y GPRS_dns2)
  dual: it uses the primary SIM of the modem and the secondary SIM. The first to be used after modem startup is the main SIM. Afterwards, the secondary SIM is used in case of problems with the main SIM
  dual2: it uses the primary SIM of the modem and the secondary SIM. The first to be used after the modem starts up is the secondary SIM. Afterwards, the main SIM is used in case of problems with the secondary SIM
• Default value: sim

Additional notes:

• This parameter should only be used with DUALSIM models
  The modem enters configuration mode when it starts up without a SIM card inside:
  If you use “sim” mode, the main SIM card must not be inserted to enter configuration mode
  If you use “sim2” mode, the secondary SIM card must not be inserted to enter configuration mode.
  If you use “dual” or “dual2” mode, none of the SIM cards must be inserted to enter configuration mode.
• Check with iotsupport@mtxm2m.com if you need additional help.

DUALSIM_mode

Description: This parameter allows you to specify the operating mode when the DUALSIM_select parameter is set to “dual” or “dual2”. Specifies whether the SIM change occurs in the event of a loss of registration in the NETWORK for X configurable seconds or an event of IP loss for X configurable seconds.

Possible values:

• registration, ip
• Default values: ip

Additional notes:

• The “registration” mode configures the modem to change the SIM in case of network registration problems for X seconds. It is the most recommended way to use
• The “ip” mode configures the modem to change the SIM in case of not being able to get an IP for X seconds. This method should only be used for configurations where the modem will have a permanent IP connection. Do not use this method if, for example, the modem will only handle SMS messages
• Check with iotsupport@mtxm2m.com if you need additional help

DUALSIM_timeout

Description: This parameter allows specifying the time, in seconds, from which a modem with the DUALSIM_select parameter configured as “dual” or “dual2” will change the SIM card if the event of loss of registration in the network or IP (configured in the DUALSIM_mode parameter) occurs during that time.

Possible values:

• 60 … 3600
• Default values: 120

Additional notes:

• Check with iotsupport@mtxm2m.com if you need additional help.