First, let me introduce myself. My name is Jonny, I work at an electronics company and do all their IT and telephone support.
We have a bunch of mainly Samsung KPDCS-12B phones and I have been asked to solve some minor niggles. All the phones are in the same building, there's just an upstairs and downstairs divide. I have the full programming manual to hand but am a bit confused by the names of some features.

If someone internally rings a direct number to another internal handset, after a certain number of rings it will divert to the main secretary/receptionist if unanswered. Can I just keep it ringing on the same phone until the internal caller hangs up?

Also, is it possible for the phone system to automatically go onto answering machine during particular hours of the day?

Cheers,
Jonny