let's say if i'm currently on a call now and someone keeps calling me on my other line, how do i temporarily turn off my call waiting? i used to have a phone that had it as an option on the call's menu but now it's hard to figure out. i swore i seen it in the manual and i can't even find the page after checking the index! i wanna say that it's *7 something but i tried it and nothing has happened. please help!