Is it Must to use BizTalk Server for Integration with Oracle Finance(ERP) ??

we are creating a Application(Intranet website) for our company and it has to integrate with Oracle Finance ERP for the following cases. 1) Budget Approval, 2) Visa Requested 3) Ticketing Information 4) Finance Board of Director Approval As we are maintaining all finance related stuff in oracle finance, I am just wondering the application(ASP.Net Site) which i am developing required to integrate with Oracle Finance using BIZTALK ONLY or Do i have other ways to talk to ERP application to proceed with workflow activities i mentioned above.

Please let me know at the earliest as this is very urgently required