Save the database on an external media and on the HDD. Turn off the PBX. Remove the DSCXL module from the socket. If the PBX is duplex, then this is the lower DSCXL module. If the PBX is mono, then this is the only DSCXL module. Remove the SIM card from the slot (see the photo). Clean the contacts on the sim card and on the module with Electra Contact Cleaner liquid. Install the sim in the slot and the module in the slot. Turn on the PBX.
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