| 摘要 |
<p>A calling subscriber device (11, 20) capable of operating over independent first (24) and second (25) communication channels registers unanswered outgoing telephone calls made over the first communication channel (24) by periodically reading a call log (22) stored in a memory (26) of the device (11, 20), compiling a list of unanswered outgoing calls over the first communication channel (24), and processing the list of unanswered calls to trigger automatically an action for enabling communication to be initiated over the first communication channel at a later time. Such action may include alerting the called subscriber device (12) that the calling subscriber had tried to initiate a call that was unanswered over the first communication channel (24). This allows call completion without the need for a voicemail server and is particularly beneficial for PTT telephones that receive an indication that a target PTT device (12) is unavailable where conventionally the target device (12) has no way of knowing that the call was originated.</p> |
