DILWORTH MICHAEL wrote:
A quick question. Is there any limitation on the file size you can
download in a WAP session using Kannel. I recently hit a 1MB limit on
Nokia's WAP gateway.
Hi Mike,
yes, there is a limit... According that most WAP gateways have WTP-SAR
implemented, which segments the transported object to fragments, you can have a
maximus as follows:
Fragments are identified by a byte, hence you have a maximum of 256 fragments in
a single SAR transaction. MTU is usually 1400 byte, so you come up to 358400
bytes in maximum object size for uploading and downloading via a standard WAP
1.2.x compliant gateway.
That's also the cause why (as far as I know all) carriers with MMSC services
limit the MMS transport to 300 KB.
Of course if you use a WAP 2.0 proxy, hence plain HTTP proxy'ing, you don't see
the WTP related limits.
There was a extention to WTP-SAR called ESAR (for extended SAR), which uses
sliding windows to raise the size up to a non-limited maximum. But the industry
decided that devices would run WAP 2.0 HTTP proxy'ing easier then ESAR via WTP.
If you need further assistance, please contact me.
Stipe
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