You have a bad hookswitch! This is absolutely the most prototypical description of what happens when a hookswitch goes bad on a Toshiba EKT telephone that I think I have ever read...
Send it to us, we will fix it.
www.p1bcinc.com
Although not as notoriously bad as the DKT 2000 series, the EKT telephones also have crummy hookswitches.
[This message has been edited by paul144 (edited July 01, 2004).]

[This message has been edited by paul144 (edited July 01, 2004).]