358:-based VoIP phones as firewalls on network interface sometimes block SIP/RTP packets. Some special mechanism is required in this case to enable routing of SIP packets from one network to other. STUN is used in some of the sip phones to enable the SIP/RTP packets to cross boundaries of two different IP networks. A packet becomes unroutable between two sip elements if one of the networks uses private IP address range and other is in public IP address range. Stun is a mechanism to enable this border traversal. There are alternate mechanisms for traversal of NAT, STUN is just one of them. STUN or any other NAT traversal mechanism is not required when the two SIP phones connecting are routable from each other and no firewall exists in between.
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phones are widely capable of VoIP performance. Besides wireless, they also typically support USB, but not
Ethernet or Power over Ethernet interfaces. The smartphone became the dominant VoIP phone because it works both indoors and outdoors, and shifts base stations/protocols easily. It achieves this
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A VoIP phone or application may have many features an analog phone doesn't support, such as e-mail-like IDs for contacts that may be easier to remember than names or phone numbers, or easy sharing of contact lists among multiple accounts. Generally the features of VoIP phones follow those of
611:". This feature allows settings stored on a server to be downloaded to the phone, based on user login. The user logs into the phone and that phone becomes the user's extension. This feature requires both a client (phone) and a server, usually in the context of
250:
by accepting higher access costs and call clarity, and other factors personal to the user. The PoE/USB VoIP phone was thus relegated to the role of a transitional device, except in traditional business office, where it is still widely used as a desk phone.
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To enable the VoIP communications, the SIP/RTP packets should be utilised and STUN client would be the key component for VoIP communications with management of the SIP/RTP packets. A
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and other PC-based phone services, which have richer feature sets but may experience latency-related problems, because they rely on mainstream operating systems' IP and audio support.
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DHCP client software simplifies connection of a device to an IP network. The software automatically configures the network and VoIP service parameters.
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can connect to this device, and make VoIP calls. While a license is required to run a cellular base station in most countries, these can be useful on
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Accounts are usually set and memorized on the phone itself. A more sophisticated feature is dynamic download of account settings, also known as "
342:. User interface software controls the operation of the hardware components, and may respond to user actions with messages to a display screen.
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A VoIP telephone consist of the hardware and software components. The software requires standard networking components such as a
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298:(RTP) is used in most VoIP systems. For voice and media encoding, a variety of codecs are available, such as for audio:
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provide an interface for traditional analog telephones to a voice-over-IP network. They connect to the
Internet or
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The overall hardware may look like a telephone or mobile phone. A VoIP phone has the following hardware components
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port and have jacks that provide a standard RJ11 interface that can accommodate a standard analog telephone.
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that have pre-installed SIP client software, or are capable of running IP telephony clients, including most
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Support for multiple VoIP accounts – the phone may register with more than one VoIP server/provider.
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Power source - a battery or DC/AC source; some VoIP phones receive electricity from
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As mainstream operating systems became better at voice applications with appropriate
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Another type of gateway device acts as a simple cellular base station. Regular
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278:(DNS). In addition, a VoIP signalling protocol stack, such as for the
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Digital IP-based telephone service uses control protocols such as the
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160:. This is in contrast to a standard phone which uses the traditional
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or purpose-built hardware devices that appear much like an ordinary
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Some VoIP phones and ATAs also support PSTN phone lines directly.
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converters: To convert voice to digital data and vice versa
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198:. Traditional PSTN phones can be used as VoIP phones with
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667:"Why Your Small Business Needs a VoIP Phone System"
60:. Unsourced material may be challenged and removed.
225:etc.) becomes available from wireless carriers,
703:
464:manufacturers provides GPP and DSP in single
8:
584:Locally stored and network-based directories
1718:Global telecommunications regulation bodies
680:VoIP — Vulnerability over Internet Protocol
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710:
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581:in that no number is stored on the client)
152:technologies for placing and transmitting
487:hardware to send and receive messages on
435:hardware to feedback user input and show
270:network stack, client implementation for
120:Learn how and when to remove this message
27:Phone using one or more VoIP technologies
657:
7:
1764:
577:Dialing using name/ID (differs from
294:, is needed. For media streams, the
186:phones can be simple software-based
58:adding citations to reliable sources
352:Session Traversal Utilities for NAT
25:
563:Common functionality and features
503:port to connect the phone to the
379:Yealink Network Technology Co Ltd
162:public switched telephone network
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1744:
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1353:Free-space optical communication
233:became the dominant interfaces.
156:over an IP network, such as the
34:
619:Secure encrypted communications
354:(STUN) client is used on some
45:needs additional citations for
443:General-purpose microprocessor
429:to enter phone number and text
288:Skinny Client Control Protocol
173:Skinny Client Control Protocol
1:
1739:Telecommunication portal
1520:Telecommunications equipment
499:Some VoIP phones include an
296:Real-time Transport Protocol
175:(SCCP) or various other ]s.
1256:Alexander Stepanovich Popov
574:Call transfer and call hold
445:(GPP) to control the device
280:Session Initiation Protocol
169:Session Initiation Protocol
1811:
960:Telecommunications history
245:OS used in 2012-and-later
1727:
1568:Public Switched Telephone
1380:telecommunication circuit
1341:Fiber-optic communication
1086:Francis Blake (telephone)
881:Optical telecommunication
535:Analog telephone adapters
262:Several Cisco SCCP-phones
200:analog telephone adapters
1479:Orbital angular-momentum
916:Satellite communications
755:Communications satellite
454:digital signal processor
419:to act as a speakerphone
1358:Molecular communication
1181:Gardiner Greene Hubbard
1010:Undersea telegraph line
745:Cable protection system
630:IP Multimedia Subsystem
254:Components and software
1500:Communication protocol
1286:Charles Sumner Tainter
1101:Walter Houser Brattain
1046:Edwin Howard Armstrong
854:Information revolution
613:unified communications
397:
389:
263:
217:(QoS) guarantees, and
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1474:Polarization-division
1206:Narinder Singh Kapany
1171:Erna Schneider Hoover
1091:Jagadish Chandra Bose
1071:Alexander Graham Bell
802:online video platform
395:
377:
261:
135:
1316:Vladimir K. Zworykin
1276:Almon Brown Strowger
1246:Charles Grafton Page
901:Prepaid mobile phone
829:Electrical telegraph
669:. Android Headlines.
636:List of SIP software
590:and multiparty calls
54:improve this article
1266:Johann Philipp Reis
1025:Wireless revolution
987:The Telephone Cases
844:Hydraulic telegraph
495:Power over Ethernet
388:T27G VoIP Telephone
1795:Network appliances
1464:Frequency-division
1441:Telephone exchange
1311:Charles Wheatstone
1241:Jun-ichi Nishizawa
1216:Innocenzo Manzetti
1151:Reginald Fessenden
886:Optical telegraphy
719:Telecommunications
609:extension mobility
588:Conference calling
539:local area network
515:There are several
404:An handset with a
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328:other audio codecs
276:Domain Name System
264:
215:quality of service
138:
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1515:Store and forward
1510:Data transmission
1424:Network switching
1375:Transmission line
1221:Guglielmo Marconi
1186:Internet pioneers
1051:Mohamed M. Atalla
1020:Whistled language
456:(DSP) to process
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16:(Redirected from
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1608:Notable networks
1598:Wireless network
1538:Cellular network
1530:Types of network
1505:Computer network
1392:Network topology
1306:Thomas A. Watson
1161:Oliver Heaviside
1146:Philo Farnsworth
1121:Daniel Davis Jr.
1096:Charles Bourseul
1056:John Logie Baird
765:Data compression
760:Computer network
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665:Chris Yackulic.
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485:wireless network
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330:, and for video
290:(Cisco), and/or
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1081:Tim Berners-Lee
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849:Information Age
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136:Flip VoIP phone
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1459:Space-division
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1484:Code-division
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1469:Time-division
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1395:and switching
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1346:optical fiber
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1336:Coaxial cable
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1251:Radia Perlman
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1141:Lee de Forest
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1136:Thomas Edison
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1126:Donald Davies
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1111:Claude Chappe
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955:Smoke signals
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933:Semiconductor
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792:Digital media
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599:Call blocking
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583:
580:
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562:
560:
557:
555:
551:
550:mobile phones
546:
544:
540:
536:
532:
530:
526:
522:
521:mobile phones
518:
511:Other devices
510:
506:
502:
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151:
150:voice over IP
147:
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92:
88:
85:
81:
78:
74:
71: –
70:
66:
65:Find sources:
59:
55:
49:
48:
43:This article
41:
37:
32:
31:
19:
1451:Multiplexing
1326:Transmission
1291:Nikola Tesla
1281:Henry Sutton
1236:Samuel Morse
1166:Robert Hooke
1131:Amos Dolbear
1066:John Bardeen
985:
965:Telautograph
869:Mobile phone
824:Edholm's law
807:social media
740:Broadcasting
675:
660:
558:
547:
533:
514:
489:data network
450:voice engine
399:
365:
349:
265:
212:
204:
182:
166:
145:
141:
139:
116:
107:
97:
90:
83:
76:
69:"VoIP phone"
64:
52:Please help
47:verification
44:
1651:NPL network
1363:Radio waves
1301:Alfred Vail
1211:Hedy Lamarr
1196:Dawon Kahng
1156:Elisha Gray
1116:Yogen Dalal
1041:Nasir Ahmed
975:Teleprinter
839:Heliographs
646:Mobile VoIP
641:Media phone
529:smartphones
417:loudspeaker
382: [
362:DHCP client
346:STUN client
231:smartphones
223:IEEE 802.21
1784:Categories
1697:Antarctica
1656:Toasternet
1578:Television
1061:Paul Baran
993:Television
977:(teletype)
970:Telegraphy
948:transistor
926:Phryctoria
896:Photophone
874:Smartphone
864:Mass media
652:References
579:speed dial
410:microphone
326:(AMR-WB),
274:, and the
247:BlackBerry
188:softphones
142:VoIP phone
80:newspapers
1681:Americas
1670:Locations
1641:Internet2
1402:Bandwidth
1106:Vint Cerf
1003:streaming
981:Telephone
921:Semaphore
812:streaming
594:Call park
569:Caller ID
541:using an
439:/messages
437:caller-id
406:headphone
221:handoff (
192:telephone
1749:Category
1636:Internet
1626:CYCLADES
1543:Ethernet
1493:Concepts
1417:terminal
1368:wireless
1191:Bob Kahn
1034:Pioneers
859:Internet
750:Cable TV
624:See also
601:feature.
543:Ethernet
519:enabled
481:Ethernet
427:touchpad
370:Hardware
241:and the
164:(PSTN).
158:Internet
146:IP phone
110:May 2012
18:IP phone
1769:Commons
1759:Outline
1712:Oceania
1631:FidoNet
1616:ARPANET
1429:circuit
998:digital
727:History
571:display
433:Display
324:G.722.2
282:(SIP),
239:Android
227:tablets
202:(ATA).
171:(SIP),
94:scholar
1707:Europe
1677:Africa
1661:Usenet
1621:BITNET
1558:Mobile
1434:packet
943:MOSFET
938:device
735:Beacon
423:Keypad
408:and a
336:H.263+
268:TCP/IP
235:iPhone
96:
89:
82:
75:
67:
1690:South
1685:North
1646:JANET
1583:Telex
1573:Radio
1412:Nodes
1407:Links
1328:media
906:Radio
891:Pager
819:Drums
785:video
780:image
770:audio
632:(IMS)
554:ships
517:Wi-Fi
501:RJ-11
452:or a
386:]
340:H.264
332:H.263
320:G.722
316:G.729
312:Speex
300:G.711
292:Skype
284:H.323
208:Skype
194:or a
179:Types
148:uses
101:JSTOR
87:books
1702:Asia
1588:UUCP
1548:ISDN
525:PDAs
523:and
505:PSTN
473:and
466:chip
308:iLBC
272:DHCP
229:and
184:VoIP
73:news
1593:WAN
1563:NGN
1553:LAN
834:Fax
775:DCT
483:or
458:RTP
425:or
356:SIP
304:GSM
243:QNX
144:or
56:by
1786::
531:.
475:DA
471:AD
462:IC
448:A
415:A
384:zh
338:,
334:,
322:,
318:,
314:,
310:,
306:,
302:,
286:,
237:,
219:5G
140:A
1720:)
1716:(
711:e
704:t
697:v
123:)
117:(
112:)
108:(
98:·
91:·
84:·
77:·
50:.
20:)
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