G400P on Elastix 4 - 1 span randomly reject calls

Hello,
I'm using G400p with Elastix 4 on Dell PowerEdge T20, this is only telephony card inserted to the box. There are 3 spans and 2 sim cards (one slot is empty). One of the sim cards (in span 2) randomly won't pass incoming calls. PBX is set to answer immediately all calls and play announcement. When problem occurs, when I call this sim card number i can hear ringtone in my cellphone, but no call is answered in asterisk and no call in logs. When i try to send sms via "gsm send sms" on this sim all is ok - sms passes through, but incoming call won't.

Reboot fix issue until next time it happens.

Hi,

Please prepare remote access for checking. For convenient contact, please add my skype linda.li258.

best regards,
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After checking client reported that simcard is 9 years old. I recomended to replace it and I will give further feedback.