Hey Khaled, fyi, check out my post on the SIM7000 here:
The SIM7600 also has telstra certification IIRC, sothere shouldn’t be any hardware issues. It’s likely a configuration problem.
How have you got it connected? Cat-m1? Nb-iot?
Calling on an LTE network requires VoLTE (I suspect) so you may need.to double check.the.protocol you’re trying to use for calling.
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