| 摘要 |
In an embodiment, a message is sent from a source telephone to a message center if a message indication is received by the source telephone in response to a call from the source telephone directed to a target telephone. The message indication indicates that the target telephone does not answer the call. The message center saves the message. If a signal strength of a transmission between the source telephone and the message center during the sending of the message is below a low signal-strength threshold, then the message is recorded to an overlay message at the source telephone. Once the signal strength between the source telephone and the message center exceeds a high signal-strength threshold, an overlay package that includes the overlay message is sent from the source telephone to the target telephone, and the message center replaces the message with the overlay message if the message exists at the message center. In this way, the target telephone may retrieve the overlay message, which was sent with a greater signal strength.
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