Answer: Please you can run <AT*PSENGI=2>, It will return PSGDMI: , , , , .
Then is the Tx level.
Note: <ATPSENGI> is an engineering command will can detect the Tx level during a call.
And the engineering command is NOT part of our official delivery.
So:
The engineering command is not official.
There is no guarantee that this AT command works fine.
You must take the full responsibility if decide to use this command.