DISPATCHER  : avoid change of  a default PORT 1521

I have configured DB 10.1.0.3 with SHARED SERVER .
If I connnected to the database (SERVER=SHARED), dispatcher would use
non-default PORT as
"D001" established:5 refused:0 current:4 max:972 state:ready
DISPATCHER <machine: ............., pid: 19839>
(ADDRESS=(PROTOCOL=tcp)(HOST=..............)(PORT=35972))
I use my database behind the firewall in DMZ , so I want to use a default PORT 1521 with my dispatcher D0001.
There was an option "PORT" in a initialization parameter DISPATCHERS in previous DB versions. I cannot use this option in the database release 10.1.0.3.
Help me?

I'm afraid you can't do that, at least with that version.
See http://download-uk.oracle.com/docs/cd/A97329_03/core.902/a92171/concepts.htm#1016370
Here an extract :
The metadata repository is always configured to use port 1521 and has a service name of the form iasdb.host.domain (for the first infrastructure on a host) and iasdbx.host.domain for any subsequent infrastructures on that host). You should never change these values.

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