How do I change the time on my NEC telephone?

The model number is: IP1NA-12TXH
I think it's called Aspirephone, it's a business kind of phone with multiple lines and extensions. With the daylight savings time early this year it has been very confusing. Thanks.

Nec Bussiness Phone System help?

My company recently acquired another and in the office they have a nec phone system. Currently the phones only ring on the front desk one but we want all to ring when a call comes through. Could someone please help? The company has given us the run around and we don't have a manual....:-(
it actually says 124i/384i on the back, would that be the model number?