I get a busy signal when I start to dial the first 3 digits after the area code of an LD number. The busy signal starts after the last digit, 6, is entered. If I use any other digit than 6 I don't get a busy signal. I have been told this is a new local exchange, 556, in the calling area code 305. I have a Definity G3Si with Release 9.1. I can call the number from my cell phone without a problem. Thanks for the help getting rid of this headache that's eaten up half my day so far.