Missing delivery reports from SMSC dropping delivery reports

[akamat sarat]

Dear Users,

We are unable to debug an issue with SMSC having to do with delivery
reports missing from SMSC over smpp bind.
The  connection to SMSC is   working properly according to kannel logs.
No obvious errors are visible in the logs.
But we are missing delivery reports that SMSC is saying were delivered and
ACKd by kannel.
Specifically they are saying that they have 'CDRs state "Delivered Direct"'
and that kannel ACKd the delivery report.
We however cannot see it in kannel access logs or SMSC logs or in any logs.
Having run tcpdumps we cannot locate it either.

Any way to debug this issue that we are missing?
Thanks,
Akamat

Re: Missing delivery reports from SMSC dropping delivery reports

[Antony Stone]

On Monday 14 February 2022 at 17:01:09, akamat sarat wrote:

> The  connection to SMSC is   working properly according to kannel logs.
> No obvious errors are visible in the logs.
> But we are missing delivery reports that SMSC is saying were delivered and
> ACKd by kannel.
> Specifically they are saying that they have 'CDRs state "Delivered Direct"'
> and that kannel ACKd the delivery report.

I would ask your upstream SMSC hoster to send you a copy of the ACK they claim 
came from kannel - preferably as a packet capture, which you can then compare 
with your own.

After all, you say "there is no ACK" and you cannot investigate something that 
isn't there.  They are saying "there is an ACK", so that is where to start 
investigating.


Antony.

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