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3GPP SGd/GDd  Application ( 16777313 )

The SGd/Gdd interfaces enable the transfer of short messages between the MME/SGSN and the SMS-IWMSC, the SMS-GMSC or the SMS Router, and the alerting of the SMS-SC by the MME/SGSN. The alerting of the SMS-SC by the MME/SGSN uses the Diameter S6c application id (16777312).
Reference:  3GPP TS29.338   View
MESSAGES

Name

Code

MO-Forward-Short-Message-Request 8388645
MO-Forward-Short-Message-Answer 8388645
MT-Forward-Short-Message-Request 8388646
MT-Forward-Short-Message-Answer 8388646