Hello,
I am having this same problem, when the call enters through gsm-1.1 or gsm-1.2 the system rejects .
See the WGW1002G log
enable "ADVANCED ---> Asterisk API ---> General
can you help me?
Sorry for the trouble. From your asterisk log, i think there is a configuration problem. May i ask GSM gateway connects which IPPBX in your enviroment?
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BTW, we are on holidays from February 10th – 21st, 2018 becuase of Chinese Spring Festival.
Your understanding will be really appreciated if our holidays bring any inconveniences.