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UNABLE TO ANSWER A SECOND CALL

Please, a customer is using N824 connected to a GSM module with 2 SIM cards but they can only receive one call at a time, meaning if an agent is on the line and there is an other incoming call it shows number busy...but they want to be able to receive multiple calls at a time without prompting the caller number busy.

What do we need to solve this problem please?

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