N

NASCing

migrating toll-free numbers by, 175–178

understanding, 328

National Do Not Call Registry, 336

needs

analyzing phone line, 24

bandwidth for PVCs, 303–304

data transfer, 295

evaluating business for toll-free numbers, 72–79

evaluating service, 13–15

frame relay network bandwidth, 303–304

network interface unit (NIU)

dedicated service requirements, 59

looping, 279–281

network layer, of OSI model, 305

nonrecurring charges (NRCs), defined, 21

no-PIC designation, dial-around codes and, 129

NPA-NXX, LERG database and, 47–48

Number Administration and Service Center (NASC)

migrating toll-free numbers with, 175–178

understanding, 328