TG100 doesn't recognize when call is answered or canceled on other SIM card



We have 2 SIM cards (Provider A1 in Austria) with the same number: one is in the TG100 and one in a smartphone.


The problem is, that the TG100 doesn't recognize when an incoming call is answered on the card in the smartphone. The SIP-Phone then still rings and the GSM module states "busy". Same thing when an incoming call gets canceled by the caller: still ringing till we answer the SIP phone. The cards act normal when we put them both in phones.


Is there a way to fix that? 


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