V

vanity toll-free numbers

requesting, 166

tips for selecting, 167–168

vendors, hardware, 18–20

virtual private networks (VPNs), MPLS and, 305

voice mail services, with no phone system, 26–27

voice service, evaluating need for, 14

VoIP (Voice over IP) providers

hardware concerns and, 19

LECs and, 12

VoIP (Voice over IP) service

choosing hardware for, 317–318

interoperability test and, 320–321

ordering, 316–317

quality problems with, 321–323

VoIP (Voice over IP) technology

IP protocols for, 311–312

researching protocols for, 319

understanding, 310–311

understanding call structure and, 312–314

using private lines and, 297

voice conversion options, 315–317

volume discounts, analyzing, 94

VPNs (virtual private networks), MPLS and, 305