| 摘要 |
<p>A machine may be configured to receive a message within an inbound request from an application. The inbound request may ask that the message be provided to a device of a recipient that is identified by a device identifier of the device, and the inbound request may specify a time by which the message is to be provided. The machine may make a request to a first communication service that the first communication service provide the message to the device by the time specified. The machine may determine that the first communication service acknowledged this request but failed to receive a confirmation that references this request. Based on this determination, the machine may choose a second communication service to provide the message and make a request to the second communication service that the second communication service provide the message from the application to the device.</p> |
