Hi Rishi,
What you are writing about sap ms and listener ports are wrong!!
SAP Message Server default port is in the range of 36NN, and Oracle listener default installation is 1527, unless you change this.
Even on a newest version of SAP: http://help.sap.com/saphelp_nw73ehp1/helpdata/en/4e/c26cdc58e968b9e10000000a42189e/frameset.htm
And by the way, port 3900 is officially registered/used:
So please double-check your info before providing your answer.
Regards,
Andre