| 摘要 |
Identifying a reply message using a relatively limited number of message source identifiers divided among multiple enterprises. In an exemplary embodiment, a message is sent with a source device to one or more target mobile devices on one or more wireless carriers. Each target mobile device can be associated with multiple enterprises. A gateway assigns one of a limited number of long codes to the message for each wireless carrier. The long code is selected from a sub-block of long codes that are associated with one of the multiple enterprises. Each long code identifies the gateway as a return address for the message. Upon receiving a second message, addressed to the long code, the gateway examines an associated target mobile device inbox for a message assigned the same long code. If a matching message exists, the gateway interprets the second message is a reply to the first message.
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