Charging for "Unanswered Calls"

As mentioned under "Charging of calls forwarded to a voice mailbox", as long as the answering signal is generated, charging commences. If the called party connects the telephone line to a customer terminal equipment which is not compatible with that of the caller and then the call drops shortly after connection, charges still apply, even though the real connection time is short. The charging scheme varies among operators but in general, airtime charges are generally calculated on a per minute basis.