I think the new SMSC doesn't support user_message_reference TLV parameter. Better to ask the SMSC directly. Hi Alt, please continue to support a little bit with answers. I spoke with the people that maintain the SMSC and they sent me a photo were it shows that the messages I send are malformed and ...

I found out that when I attach parameter it returns RSUBMITFAIL, if I don't attach it returns OK.
What should I do? Is it a limitation of the infrastructure of the company? What it might be?

Thank you for replying. I've done what you're suggesting. The application has been working for a few months and when they used a new SMSC it stopped working. Through debugging and experimentation I found out that there's something going on with TLV optional Tags. PLsfix.PNG In the image above if I c...

Would you please help me out? I am trying to send sms but it always fails. Configuration Settings: <add key="SMPP_CONNECTION_RETRY_DELAY_IN_SECONDS" value="5"/> <add key="SMPP_DATA_CODING" value="0"/> <add key="SMPP_WORKING_THREADS" value="8"/> <add key="SMPP_RECOVERY_DELAY_IN_MINUTES" value="1"/> <...