The telecom giant's high yield appears sustainable, which should attract investors as interest rates come down.High-yield dividend stocks often rally in response to interest-rate cuts. This relationship stems from investors seeking higher returns as yields on fixed-income securities decline.With the Federal Reserve expected to enter a long-tailed rate-cutting cycle, dividend-paying stocks with yields above the 3% mark are under the spotlight. For instance, AT&T (T -0.23%), a longtime favorite among income i ...