Northwestern Bell 529051/2 2-Line Phone price and reviews

I bought 3 of these for my new office. About 20% to 30% of the time on long distance calls, clients complain of a bad noise when they call, and have to call back to eliminate it. Sometimes it eliminates it; sometimes it doesn't.

Also, I cannot make 3-way calls with this phone. Actually, I can place the call, but the other parties come through intermittently and then disappear within a few minutes. Obviously, I can't conduct business this way. I'm having to replace all 3 phones.

Before moving my office, I had 2 2-line phones of another brand that worked fine with neither of these problems.