Dear all, I also send SMS over a german SMS service-center from t-mobile. I allways send OT51 with request for notification. The Notificatin is received from a extra Script with wait_in_loop. Generelly this works good, and i can assign the notification to the send SMS with the Field sm in the receifed OT51-result. But sometimes I receive a OT-53 in the error-text instead of the expected OT51-result. In that case, I get no Id of the send message, and I can't assign the later received notification to the send sms (and so to the email of the sender). Is there a way to avoid this? Or is there another way to assign the notification to the sender? Thanks for any help, kind regards, Klaus Schuetz

Thank you, Marco, for the fast answer. I do step 1), send OP51 type O. Then (sometimes) I get back fom the SMSC OP53 type O form a SMS, that was send before, instead of the OP 51 type R. That happened, if my 2nd. Script don't receive the OP 53 type O with wait_in_loop, and the OP 53 type O is still on the SMSC. One packet later the SMSC sends the OP 51 type R, but in the $error_text from the command

there is the OP 53. Maybe my script is bad, I'm not a perl-master. Should I send you a dump or any other Information? Regards, Klaus