Capture Changes from Sql Server  using Oracle Streams  - Destination Oracle

Is it possible to capture changes made to tables in Sql Server database and propagate the changes to Oracle Database using Oracle Streams and Heterogeneous Gateway. I see plenty of information about pushing data from Oracle to Sql server, but I haven't been able to find much information about going the other way. Currently we are using sql server 2005 replication to accomplish this. We are looking into the possibility of replacing it with streams.

the brief understanding i have is that there is nothing out of the tin that Oracle provides to stream between SQL Server and Oracle. The senario is documented in Oracle docs however and says you need to implement the SQL Server side to grabe changes and submit to Oracle stream queues.
i'm sure i've seen third parties who sell software to do this.
If you know otherwise please let me know. Also wasn;t aware one could push from SQL Server to Oracle. Is this something only avail in SQL Server 2005 or does 200 also have it? How are you doing this?
Cheers

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