The distributor replaced my device to a new WGW1002G. The error is the same. I hear the call waiting tone and simultaneously approx. 5 seconds of the first call is muted.
Mr Dred use gateway with gsm module m35, there is no solution for that now. But we have solution for other module.
Please check your module version.
Go to MODULE ---> Toolkit page and run AT command ATI to check the module version.
Or you can prepare remote access for checking.
For convenient contact, you can add my skype below.
Best regard,
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skype: linda.li258