Long Concatenated WAP PUSH over SMS

StackOverflow https://stackoverflow.com/questions/3286054

  •  17-09-2020
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Question

Can anyone kindly explain how to send a concatenated WAP PUSH SMS? I can send an SI that spans just one message, but I haven't figured out how to send one that spans multiple messages

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Solution

If you send a WAP Push message with a SMS Bearer, you've got a SMS with a User Data Header. This User Data Header looks like 0605040B8423F0 and contains so to say source and destination port for the WAP Push App in your phone. 0B84 is the destination port number (2948), 23F0 is the source port number (9200).

To send a WAP Push longer than 133 Bytes you have to add a Concatenation Header to the UDH, the UDH will then look like

0B00033F020105040B8423F0 for the first SMS and

0B00033F020205040B8423F0 for the second SMS

Split the remaining Wap-Push data in 128 Byte Chunks and append them to the UDH.

The glory details are part of the 3GPP Specification 23.040 found at http://www.3gpp.org/ftp/Specs/html-info/23040.htm

hth cheerio Steve

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