Linked Server - OLE/DB Provider 'MSDAORA'

We have created linked server between SQL Server 2000 and Oracle 10g in offshore environment as well as onsite environment,both the environments are almost IDENTICAL.Basically, the whole execution happens on Oracle and the output is passed to SQL Server.When the below query is executed in offshore environment it is returning values perfectly.

SELECT * FROM OPENQUERY(ORACLE_LINK,'{Call TEST.IVR.lo_Dlr_GetInfo(55,{resultset 2,p_ReturnVal})}')

Here: ORACLE_LINK - is the Linked Server Name,
TEST - Oracle Schema Name
IVR - Oracle Package Name

But when the same query is executed on onsite environment it is raising the following error.

Server: Msg 7321, Level 16, State 2, Line 1
An error occurred while preparing a query for execution against OLE DB provider 'MSDAORA'.
OLE DB error trace [OLE/DB Provider 'MSDAORA' ICommandPrepare::Prepare returned 0x80040e14].
The environment details are:

Offshore Environment(Successfully returning values):

1)Operating System - Windows 2000 Advanced Server
2)Service pack on Operating System - SP4
3)Version on MSDORA.dll(C:ProgramFilesCommonFilesSystemOLED B) - 2.81.1117.0
4)Version on tstbestsql1---SQL Database - SQL Server 2000 Enterprise Edition
5)ServicePack on tstbestsql1---SQL Database - 8.00.2040 (SP3a)


Onsite Environment:

1)Operating System - Windows 2000 Advanced Server
2)Service pack on Operating System - SP4
3)Version on MSDORA.dll(C:ProgramFilesCommonFilesSystemOLED B) - 2.81.1117.0
4)Version on tstbestsql1---SQL Database - SQL Server 2000 Enterprise Edition
5)ServicePack on tstbestsql1---SQL Database - 8.00.2040 (SP4)

We are able to execute if we are executing the query as

SELECT * FROM OPENQUERY(ORACLE_LINK,'select column1 from table1') on the Onshore server and it is perfectly returning the value.I believe the problem might be with "Call" if anyone can help with it that will be great.

Thanks,
Raahul