If I send a push message to terminal through SMSC. How does the terminal
know this short message is a push message?


it goes to the WAP Push port (coded in the UDH)

How does SMSC know?

it doesnt know and it doesnt have to know. Its just payload to transport from SME to handset for the SMSC.

Such push message may include SI/SL, SIR and MMS
notofication.

correct.

So one header in SMPP should be set. But what header?

No additional special header is required. UDH is enough.

Andreas Fink
Global Networks Switzerland AG

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