This to cause problems with answering machines and faxes, but the switch to digital voice mailboxes operated by phone companies largely eliminated that problem. Also, the widespread use of caller ID combined with the easily recognizable electronic tune played before the collect-call warning makes many people hang up immediately if they hear the tune and the number has not been recognized.International collect calls, for countries for which it is available, are not automated and must be placed through Embratel's international operator, dialing 0800-703-2111 .