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