Power button mutes/unmutes in-progress calls #17
+47
−1
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During a call, you can now press the power button to mute/unmute the call, this replaces the green phone icon with a red one with a strike-through when muted, and puts the original back when unmuted.
I looked up the muting AT command in both the SIM800 and SIM7600 manuals and it appears to be the same, however I could only test with with a SIM7600.