User:Pnm/sandbox/Voice over IP

Voice over IP
 * Key differences
 * Lower provisioning cost
 * Bandwidth shared with other services
 * Can route multiple calls through one connection
 * Can send video, text, data
 * Managing QoS
 * Reduced location dependence
 * Easier roaming
 * Reduced location information
 * Dependence on reliability of Internet connection
 * Less redundancy
 * More susceptible to power failure
 * Device incompatibility
 * Fax machines, telephones, other devices
 * Technology
 * User experience
 * Dedicated VoIP phone (wired or wireless)
 * IP analog telephone adapter
 * VoIP + cell hybrid
 * Soft phone
 * Integration with PSTN and cellular
 * Gateways (hardware)
 * Echo?
 * Caller ID
 * Number portability
 * Business systems / IP PBX
 * Hosted PBX
 * Protocols
 * Security
 * Ease of encryption
 * Service providers (Vonage, Skype, Comcast Digital Voice, SIP/IAX providers, other VoIP termination services)
 * Regulation
 * United States
 * European Union
 * Republic of Korea
 * Japan
 * Origins