How to add a new DB listener port 1523 in addition to the existing db listener port 1521 on Oracle A

We need to add a new DB listener port 1523 in addition to the existing db listener port 1521. The Purpose of this activity is to the non-default port 1523 should be used by Oracle EBiz environemnt and the default port of 1521 should be used by other third party apps like Hyperion, OBIEEE, etc. Kindly provide the steps to add the non-default db listener port 1523 in database tier and Application Tier. Our environment is running on RHEL 5.10 with Oracle Applications R12.1.3 and database version of 11.1.0.7.