delivery reports and EMI [known bug issue]

[Andreas Fink]

Hello folks,

There's a know bug in EMI which causes delivery reports to sometimes fail under high load.

the issue is the following

You sent two or more messages in the same second to the same SMSC.
The EMI/UCP SMSC will respond with the same timestamp for both messages.

You get a delivery report for one of the messages. Now you have to match it to one of the DLR entries in memory or in the MySQL DB. You don't know which one so you might end up sending a delivery report to the wrong URL who just happened to have sent a message in the same second.

The fix for this is to make phonenumber + timestamp the key instead only the timestamp.
The DLR code is ready for that but there's an issue.

Here is an example:

I'm sending out a message to myself.
My gateway ALWAYS sends in international format
So + is being replaced with 00.

so the destination number in the EMI 51 packet will contain 0041792457333 as my number.
the acknowledgement of the EMI51 looks like this:

<92/00046/R/51/A//0041792457333:121102143948/E5>

0041792457333 is the destination number
121102143948 is the timestamp

so Kannel saves this information into DLR storage.

Now the message gets delivered and a delivery report arrives:
we get:
<09/00297/O/53/30069/0792457333/////////////121102143948/0/000/121102143952/3//4D65737361676520666F7220303739323435373333332C2077697468206964656E74696669636174696F6E2030323131313231343339343820686173206265656E2064656C697665726564206F6E20323030322D31312D31322061742031343A33393A35322E/////////////0A>

the problem here is that the number now became suddendly a national number by removing the 00 and 41 (country code) and replace it with a national long distance prefix 0.
to fix this is easy. We re-internationalize the number again. However, some users might not want to have it this way. So another config variable has to be added maybe which I really want to avoid.

Does anyone has some brilliant ideas how we can solve this "always unify the number format" for EMI without making configuration of the SMSC a nightmare of config variables?
Should we simply replace incoming number with 0 with 00+ country code? But whats the country code -> config variable again?





Andreas Fink
Fink-Consulting

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