Above entry is an example only. The home and remote interfaces in entry above should be fully qualified classname for e.g. com.example.CustomerNumbersHome. In <ejb-ref-type> put the tyoe of your bean session or entity.
Once you make an entry here, then application server will take care of every thing, please do not bother about IIOP URI+PORT etc..It is application server's responsibility.
SCJP 1.4, SCWCD 1.4, SCBCD 1.3, ITIL V3 Foundation Certification