Re: Missing delivery reports from SMSC dropping delivery reports

Am 14.02.22, 18:01, schrieb 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

Hi Akamat,

what COULD be the case here is that Kannel bearerbox does ACK the 
deliver_sm PDUs from the SMSC with a corresponding deliver_sm_resp PDU, 
(so from the SMSCs perspective they are acknowledged), but your DLR 
message ID setup (or smsc-id patch setup) is configured wrong in Kannel, 
and the DLR is formally not resolved in bearerbox to the temporary data 
that is store in the DLR storage. Hence the DLR is "not found", and then 
not logged to the access-log (in older releases).

Suggesting you run the bearerbox.log (log-file) in DEBUG level 
(log-level = 0), and then check that you DO see the deliver_sm PDUs from 
the SMSC.

Additional things to check:

- Make sure you are AWARE of the message ID notation. Some SMSCs use hex 
in submit_sm_resp PDU, but decimal in the deliver_sm payload (see 
msg-id-type directive)

- If you splitted the SMPP binds in receiver and transmitter, make sure 
they have the same 'smsc-id' identifier, otherwise you would receive a 
DLR on the receive bind that would not resolve correctly from the DLR 
storage, since the transmitter side used a difference smsc-id tag.

-- 
Best Regards,
Stipe Tolj

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