sccp protocol classes :????? This topic has 15 replies, 1 voice, and was last updated 11 years, 5 months ago by Anoop. Viewing 16 post (of 16 total) ← 1 2 Author Posts 12th July 2013 at 09:57 #39984 AnoopGuest DT1 and DT2 are SCCP messages. DT1 is used Class2 Basic Connection Oriented and DT2 for Class 3 Flow Control COnnection oriented. Author Posts Viewing 16 post (of 16 total) ← 1 2 The forum ‘Telecom Design’ is closed to new topics and replies.