Oracle Communications Suite upgrade from 6 to 7

Hi

I have the following deployment running :

                        

    Item  Description

    ----  -----------

      1  Messaging Server 7.0 (7.0-0.03)

       2  Comms DSsetup 6.4 (6.4-1.04)

       3  Comms Delegated Administrator 6.4 (6.4-2.05)

       4  Calendar Server 6.3 (6.3-7.03)

       5  Instant Messaging 7.3 (7.3-03.09)

       6  Communications Express 6.3 (6.3-6.01)

       7  Convergence 0.2 (0.2-0.36)

And i want to upgrade to the following products :

    Item  Description

    ----  -----------

       2  Messaging Server (64bit) 7.0.5.34.0

       3  Comms DSsetup 6.4.0.26.0

       4  Calendar Server 7.0.4.15.0

       5  Instant Messaging 9.0.2.6.0

       6  Convergence 3.0.0.1.0

       7  Indexing and Search Service 1.0.5.22.0

       8  Contacts Server 8.0.0.0.0

       9  Delegated Administrator 7.0.0.11

Is there any procedure to follow in order to achieve this task ??

Thanks.

Marouane