Hi Indraneel,
I have worked on my previous project on Container tracking where we implemented custom solution with INTRAA.
We have used Webmethods as middleware tool, where we get EDI message Container Ocean Shipping end to end scenario EDI 300 - Booking Request, EDI 301 - Booking Confirmation, EDI 303 Booking Cancellation, 312 - Container Arrival Notice, EDI 313 - Shipment Status Inquiry etc.
INTRAA (4PL) itself like SAP TM, so you can receive directly all the statuses through RFC in SAP EM through middleware tool or if INTRAA can call directly SAP EM RFC then you can integrate. I believe, INTRAA has new lite version which has more capability to integrate any third party systems adapters directly.
As we know standard integration points are available to connect SAP EM to SAP TM in most of the stages, once you establish connection between INTRAA and SAP EM.
Regards
GGOPII