Your SMSC operator will probably be able to tell you how they do it. Possibly they use TLV fields in the smpp pdu.
Van: users [mailto:users-boun...@kannel.org] Namens Lester Freamon Verzonden: maandag 4 januari 2016 20:01 Aan: Kannel Users <users@kannel.org> Onderwerp: Additional telecom parameters Hello, An SMSC operator I have a connection to is stating that they're able to send additional auxilary information along with the standard SMS message, timestamp, user's phone number and destination phone number. Upon looking at all available parameters, I'm unable to identify which would be used to store any auxilary information. >From looking over the PDU specification, I don't see any fields that would >allow for this non-standard information to be stored. Is this possible if running in text-mode as opposed to PDU mode? How can I determine what mode Kannel is currently running in?