| 摘要 |
A system may include one or more network devices. The one or more network devices may receive a short message service (SMS) message intended for an access terminal, embed the SMS message into a data message, determine whether a data session exists with the access terminal, the data session occurring over a data network, transmit the data message to the access terminal via the data network when the data session exists, and transmit the SMS message via a voice network when the data session does not exist.
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