Oracle Database Discussions

Hello,
I just installed Oracle 11.1.0.6.0 on SuSE Linux. I performed basic installation with database creation and created started database orcl. After installation i fount that tns listener is listening on port 1522 instead of default port 1521.
I have two questions regarding the 1522 port. There is no other taks listening on port 1521
1) Can anyone say me why is this happening ?
2) How can I change the port number to default 1521 ? (just edit listener.ora ?) Is it safe operation, ie it wont disturb EM or other tasks on server ?

here is status from lsnrctl

LSNRCTL> status
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1522)))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Linux: Version 11.1.0.6.0 - Production
Start Date 26-OCT-2009 09:50:52
Uptime 0 days 10 hr. 43 min. 2 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /opt/oracle/111/network/admin/listener.ora
Listener Log File /opt/oracle/diag/tnslsnr/db/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1522)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=db.site)(PORT=1522)))
Services Summary...
Service "orcl" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
Service "orclXDB" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
Service "orcl_XPT" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
The command completed successfully

Edited by: kamilp on Oct 26, 2009 1:36 PM