If you are unable to pay off your credit card you will ultimately get what is known as "charged off". When the account is charged off it can no longer be used and all interest, fees and charges are suspended.
The bank simply tries to recover the outstanding balance.
This usually takes 90 - 120 days depending on the bank.
If you lose your job and have no income, no ability to pay the bank they might offer to charge it off early instead of waiting three or four months. By doing this you will save the interest charge in those months plus a late payment fee, maybe a bounced DD fee, overlimit fee if your interest and fees put you over that.
If you think you will be unable to make the payment in the near future then charging off early is a good idea to avoid all the fees which add up when going towards charge off.
If you can't make the payment then I wouldn't worry about the ICB. It only will accurately reflect your dinancial status at present.