SSIS OLEDB Command Transformation Output columns not available

Below is my problem statement:

I have data in a table in DW(MS SQL 2008) which has a column say domainName which has values like www.yahoo.com. Now I need to use this table and for each row in this table I need to call a SP in Oracle(which is in an different server) which takes the domainName as an input and returns the IPAddress. My destination table just have 2 columns, domainName and IPAddress.

For me to achieve this, I am trying to use OLEDB Command Transformation. Below is how the pipeline looks like:

OLEDB Source Transformation --> OLEDB Command Transformation --> OLEDB Destination Transformation

The problem I am facing are 2:

a) I think I cannot pass the arguments to SP correctly. The SQL I am using in OLEDB command is as below:

SELECT
? domain_name,
schema.ora_packge.get_ip_address(?) ip_address
from dual

b) I cannot get output columns from OLEDb Command transformation.

NOTE:

a) I am using SSIS 2008.

b) I cannot change the SP as it's managed by a different team.

c) I tried using a For each Loop at control flow level. Even though that's working. But I don't think it's and efficient way of doing it.

d) I also came to know that an anonymous block in Oracle cannot return anything.

Please pardon me, if this has been answered already. I did search quite a lot.

Thanks

Deb