I am getting an intermittent problem some dropped calls through a G400P card (used for voice calls and text messages). By cunning insertion of NoOp() statements into the dialplan, I have found that ${HANGUPCAUSE} = 8 whenever this happens.
However, I am really none the wiser; the most I can discover is that Hangup Cause 8 is "Pre-empted", with no further explanation.
I wondered whether it was caused by someone trying to dial in on a line which was already in use for an outbound call, or by trying to send an outbound SMS (using a CLI command, such as `gsm send sms 1 07778429726 WIBBLE`) or even by the arrival of an inbound SMS, but I cannot disrupt an established call using any of these methods.
Can anyone help me work out what might be the problem and how to cure it?
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