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To get this functionality you have to set in the PRI cofiguration tool the proper Mode of switching SIM card. Go to the menu Gateway configuration > GSM outgoing groups > Mode of switching SIM card and select one of following:

  • By time and limit; then SIM 1
  • Random and limit; then SIM 1 

See the complete description of modes below.

Mode of switching SIM card defines how the SIM cards will be used in the selected GSM group

  • SIM # - the SIM cards in the position # will only be used in the selected GSM group. In this case the Maximum called minutes and Disconnect call parameters are disabled (calling without any limitations).

  • By time - the SIM card will be switched according to the Time of use parameter and call timer limitations.

  • Random - the SIM card will be switched randomly at defined time intervals and according to call timer limitations.

  • By time and limit; then SIM card 1 - the SIM card will be switched according to the Time of use parameter and call timer limitations. After exceeding free minutes is SIM switched to SIM1. SIM1 is used for incoming and outgoing calls. Next SIM with free minutes will be switched regarding set time intervals. After exceeding free minutes on all SIMs, SIM1 will be used for incoming and outgoing calls.

  • Random and by limit; then SIM1 - the SIM card will be switched randomly at defined time intervals and according to call timer limitations. After exceeding free minutes is SIM switched to next SIM with free limit. After exceeding all SIMs, SIM1 will be used for incoming and outgoing calls.