at first: I´m sorry for my english.

I´ve a problem with the forwarding.
Problem is: when user 123 is speaking, all incoming calls should be forwarded to user 456. That´s no problem, I simply could set the option "Overflow busy to associate set". But if user 456 goes to lunch, he wants his telephone to be forwarded to User 123 with the option "Immediate forward". But then he gets the message "Feature rejected". If I try to make this setting in the telephone system over the console-mgr or OmniVista, I´ll get the errormessage "Forward Directory Number : Loop in the forwarding numbers".
Is it possible to tell the system to ignore the potential loop? We use the overflow on associate after 4 rings and there the system doesn´t refuse the potential loop!
And another problem is the function "Busy camp on". It works right für internal calls, but if a call comes from extern, the caller gets a busytone. What do I have to do to activate the "Busy camp on" for external calls?
Thanks in advance from Hamburg, Germany
Marco