In TCP over OBS communications, the existing architecture namely �Destination based Burst Aggregation� cannot guarantee the delivery of Real Time traffic as the packets belonging to different priorities are assembled into a single Data Burst. In this paper, a new architecture is proposed at the ingress of the OBS network called �Packet Priority Classifier and Burst Transcription based Burst Aggregation�, in which packets with Real Time Constraints are aggregated into a Data Burst labeled as Delay Sensitive Bursts (DSBs) and the others assembled into Best Effort Bursts (BEBs).