Federated VoIP

Federated VoIP is a form of packetized voice telephony that uses voice over IP between autonomous domains in the public Internet without the deployment of central virtual exchange points or switching centers for traffic routing.wikipedia
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Voice over IP

VoIPvoice over Internet Protocolvoice-over-IP
Federated VoIP is a form of packetized voice telephony that uses voice over IP between autonomous domains in the public Internet without the deployment of central virtual exchange points or switching centers for traffic routing.
Third-generation providers, such as Google Talk, adopted the concept of federated VoIP—which is a departure from the architecture of the legacy networks.

SIP URI scheme

SIP address
Federated VoIP and telephone number mapping

Telephony

digital telephonytelephonedigital
Federated VoIP is a form of packetized voice telephony that uses voice over IP between autonomous domains in the public Internet without the deployment of central virtual exchange points or switching centers for traffic routing.

Internet

onlinethe Internetweb
Federated VoIP is a form of packetized voice telephony that uses voice over IP between autonomous domains in the public Internet without the deployment of central virtual exchange points or switching centers for traffic routing.

Telephone number mapping

ENUME.164 Number Mapping
Federated VoIP uses decentralized addressing systems, such as ENUM, for location and identity information of participants and implements secure, trusted communications (TLS) for identify verification.

Telephone call

callphone callphone calls
The traditional telephone networks are based on the principle of point-to-point communications, for example, an office building sends and receives phone calls over an ISDN line to the telephone exchange.

Integrated Services Digital Network

ISDN ISDNISDN30
The traditional telephone networks are based on the principle of point-to-point communications, for example, an office building sends and receives phone calls over an ISDN line to the telephone exchange.

SIP trunking

SIP trunking gatewaysSIP TrunksSIP-trunking
Early Voice over IP deployments have copied this model, sending phone calls over SIP Trunking (a virtual equivalent of ISDN) to an Internet telephony service provider (ITSP) (a virtual telephone exchange).

Internet telephony service provider

ITSPsNet telephonyVoIP services
Early Voice over IP deployments have copied this model, sending phone calls over SIP Trunking (a virtual equivalent of ISDN) to an Internet telephony service provider (ITSP) (a virtual telephone exchange).

Telephone number

phone numbertelephone numbersphone numbers
Such paradigms have striven to emulate many of the aspects of traditional telephony, such as the telephone number.

Post office

receiving officepost officespostal clerk
The fundamental principle of federated voice over IP is that it removes this concept of a virtual exchange, just as email has eliminated the concept of a centralized system of post offices.

XMPP

JabberExtensible Messaging and Presence ProtocolJabber/XMPP
Although there is no formal specification for federated VoIP as a whole, the Session Initiation Protocol (SIP) and Extensible Messaging and Presence Protocol (XMPP/Jabber) both specify similar and compatible ways of implementing federated VoIP.

X.509

X.509 certificatesX.509 v3certificate-based
the use of X509 Digital certificates to allow the caller and callee to prove their identity to each other is specified in Domain Certificates in the Session Initiation Protocol and the Extensible Messaging and Presence Protocol (XMPP): Core (s13.7)

Public key certificate

digital certificatecertificatedigital certificates
the use of X509 Digital certificates to allow the caller and callee to prove their identity to each other is specified in Domain Certificates in the Session Initiation Protocol and the Extensible Messaging and Presence Protocol (XMPP): Core (s13.7)

Debian

Debian GNU/LinuxDebian ProjectDebian Linux
the Debian project describes federated VoIP as part of their Unified communications initiative

Unified communications

Unified Communicationcommunicationsunif
the Debian project describes federated VoIP as part of their Unified communications initiative

Open-source software

open sourceopen-sourceopen source software
Various open-source VoIP server products provide detailed instructions on how to implement federated VoIP.

Session Initiation Protocol

SIPSession Initiation Protocol (SIP)SIP Trunking
Although there is no formal specification for federated VoIP as a whole, the Session Initiation Protocol (SIP) and Extensible Messaging and Presence Protocol (XMPP/Jabber) both specify similar and compatible ways of implementing federated VoIP.

Softphone

soft phonePC-to-PC calling
installing IP phones, or softphone applications on computers or smartphones

Smartphone

smartphonessmart phonesmart phones
installing IP phones, or softphone applications on computers or smartphones

Caller ID spoofing

spoofspoofeda false origin is displayed
As a Federated VoIP scheme provides a direct Internet connection which does not pass through a signaling gateway to the public switched telephone network, it shares the advantages (nearly free unlimited access worldwide) and disadvantages (ernet applications).