EC200T-AU sometimes no incoming or outgoing voice calls

IoT Modules LTE Standard Module
1

Hello friends I have EC200T-AU sometimes no incoming or outgoing voice calls, why??? how fix them??

Best regards,

Nelson

2

HI Nelson
Do you have an antenna plugged in? Please check the signal quality when you can’t make calls. Use the at+qeng=“servercell” command

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3

hello, when i use the module in WDCMA it works, but in LTE band no receive incoming calls why?