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Contents Articles Voice over IP 1 1legcall 16 Voice Funnel 17 Arbinet 17 Call-recording software 19 Generic Access Network 23 International gateway 28 Internet telephony service provider 29 iobi 30 VoIP phone 31 IP-DECT 34 Media phone 34 Mobile VoIP 35 MoIP 38 One Source Networks 39 Peer-to-peer SIP 42 Purple minutes 43 SIP connection 43 SIP provider 44 Telephone VoIP Adapter 45 UMA Today 46 VoATM 47 Voice engine 48 Voice over WLAN 48 VoIP recording 50 VoIP VPN 52 Web-based VoIP 53 8x8 54 Aastra Technologies 56 Aculab 57 Apex Internet 60 Apptix 61 AT&T CallVantage 62 AudioCodes 63 AVST 65 BabyTEL 68 Bandwidth.com 69 BlueFace 71 Bond Wireless 73 Brekeke PBX 76 Brekeke SIP Server 77 BroadVoice 78 Broadvox Communications 79 Callware 81 Clearwire 84 Com Hem 90 Comcast 96 Covad 113 Damovo 115 Deltathree 116 Dialogic Corporation 119 Dreamtilt 121 EarthLink 123 Eicon 128 Engin Limited 130 Eventis 132 FaktorTel 133 Fastweb (telecommunications company) 135 Fibernetics Corporation 136 Free World Dialup 137 Freephoneline.ca 138 Freshtel 139 Gizmo5 141 GlobalRoam 144 Grasshopper (company) 146 HipVoice 148 IConnectHere 149 Inphonex 150 Internode (ISP) 152 IPdrum 155 Ipkall 156 Iristel 157 Jajah 159 Jaxtr 161 Lingo (VoIP Service operator) 163 Mind CTI 164 Mitel 166 MKC Networks 170 Mobivox 171 Morodo 173 NEC Unified Solutions 174 NetTALK 175 NextGenTel 176 Nokia Siemens Networks 177 Nortel 181 Nuvio Corporation 196 Ooma 197 Orbitel 201 OVETEL 204 PhoneGnome 206 Primus Canada 207 Primus Telecom 209 Primus Telecommunications (Australia) 216 Radvision 220 Rebtel 222 Rigatta 224 RingCentral 225 SIP Broker 228 sipgate 229 sipservice 230 Skype 232 Skype Limited 250 Snapvine 254 snom 255 Speakeasy (ISP) 257 Spikko 259 SPIRIT DSP 260 SunRocket 261 Super Technologies 262 T-Home Macedonia 265 TalkFree, Inc 266 TalkSwitch 267 Tdsoft 269 Telesphere 270 Telio 271 Time Warner Cable 272 TouchWave 283 Tpad 286 Troy Cablevision 287 UTStarcom 288 Veraz Networks 290 Vivox 292 Vocalocity 297 VocalTec 299 VoicePulse 301 Speedflow Communications 303 Voipfone 305 Vonage 307 Voxofon 314 Vyke 317 White Label Communications Ltd 322 ZON Multimédia 323 Zoom Telephonics 324 Zultys 325 Analog telephone adapter 326 Avaya Communication Server 2100 327 Avaya Communication Servers 330 Avaya IP Phone 1120 331 Avaya IP Phone 1140E 333 BT Fusion 335 Chatter bug 336 GXP 2000 336 LG-Nortel IP Phone 8540 337 Linksys iPhone 338 Linksys PAP2 339 magicJack 341 SPA2102 343 SPA3102 344 Tk6000 345 Convergence Technologies Professional 346 SIP Forum 347 SIPfoundry 348 Voice over IP Security Alliance 349 Voice over the Net 349 Authenticated Identity Body 350 Call Admission Control 350 Distributed Universal Number Discovery 351 H.248 352 H.323 353 Hookflash 365 Inter-Asterisk eXchange 365 IpTTY 367 Jingle (protocol) 367 List of SIP request methods 369 List of SIP response codes 370 Media Gateway Control Protocol 373 Media Gateway Control Protocol (Megaco) 374 Media Gateway Control Protocol (MGCP) 375 Message Session Relay Protocol 377 MiNET 379 Network Voice Protocol 379 Network-based Call Signaling 380 Open Phone Abstraction Library 381 Open Settlement Protocol 382 Real-time Transport Protocol 383 Registration, Admission and Status 387 RTP audio video profile 388 Session Initiation Protocol 392 Signaling Compression 397 Simple Gateway Control Protocol 398 SIP Trunking 399 Skinny Call Control Protocol 400 Skype protocol 401 T.37 ITU-T recommendation 407 T.38 ITU-T recommendation 408 UNIStim 411 AIM Call Out 413 AIM Phoneline 418 Call You Free 423 Entanet 425 Yahoo! Voice 430 FiOS Digital Voice 431 fring 433 Google Voice 437 MChat! 445 MindSpring 446 Mysipswitch 449 OctroTalk 451 OpenSky service 452 Optimum Voice 453 PrivatePhone 453 Quikcycle 456 Teleo 457 TelSIP 458 TestYourVoIP 460 VoIP User 461 6rounds 464 Asterisk Gateway Interface 465 Avaya Application Server 5300 466 Avaya Proactive Voice Quality Management 470 Brosix 472 Call-Processing Language 474 Cipango (sip server) 476 Cisco IP Communicator 477 Cisco Unified Communications Manager 478 Cisco Unified Provisioning Manager 484 Comparison of VoIP software 485 CoolTalk 498 D2 Technologies 499 Echolink 500 Ekiga 502 Eyeball Chat 504 Fetion 505 Google Talk 506 H323Plus 511 HamSphere 513 IP PBX 514 Jitsi 517 JSLEE 520 KPhone 521 Linphone 523 Lyceum (synchronous CMC software) 524 Mobicents 526 Mohawk Voice 530 Natpass 532 Nautilus (secure telephone) 532 Net2Phone 533 Nuvoiz Communicator 534 OfficeSIP Messenger 535 omNovia Technologies 536 OpenH323 537 OpenSER 539 OpenSIPS 541 PGPfone 541 PhonerLite 542 QuteCom 544 Revation Communicator 547 Revation LinkLive 550 Roger Wilco (software) 552 S4PG 553 SAM Broadcaster 558 SFLphone 560 SightSpeed 562 List of SIP software 563 SIP Express Router 567 Sippy B2BUA 569 sipX 570 Softphone 572 TokBox 573 Tru (mobile network) 576 Unison (collaboration software) 581 Vbuzzer 582 Ventrilo 584 Verba Technologies 586 Voice Operator Panel 588 VZOchat 589 VzRoom 591 Windows Live Messenger 595 X-Lite 606 Yahoo! Messenger 607 Yuuguu 612 Zfone 613 Zingaya 614 Anti-tromboning 615 Back-to-back user agent 616 Call Agent 617 Call origination 619 Comfort noise 619 Host Media Processing 620 IP Multimedia Subsystem 621 Lawful interception 631 Mouth-to-ear delay 635 Multimedia Telephony 635 Origination 636 Packet loss concealment 637 PacketCable 638 Session border controller 641 Signaling gateway 645 STUN 646 Survivable Branch Appliance 649 Talkspurt 649 Traversal Using Relay NAT 649 Trunking gateway 651 Vishing 651 Voice chat 653 Voice peering 654 VoIP spam 654 WebCall 655 White, black and grey routes 655 Wideband audio 656 References Article Sources and Contributors 658 Image Sources, Licenses and Contributors 673 Article Licenses License 677 Voice over IP 1 Voice over IP Voice over Internet Protocol (Voice over IP, VoIP) is one of a family of internet technologies, communication protocols, and transmission technologies for delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. Other terms frequently encountered and often used synonymously with VoIP are IP telephony, Internet telephony, voice over broadband (VoBB), broadband telephony, and broadband phone. Internet telephony refers to communications services—Voice, fax, SMS, and/or voice-messaging applications—that are transported via the Internet, rather than the public switched telephone network (PSTN). The steps involved in originating a VoIP telephone call are signaling and media channel setup, digitization of the analog voice signal, encoding, packetization, and transmission as Internet Protocol (IP) packets over a packet-switched network. On the receiving side, similar steps (usually in the reverse order) such as reception of the IP packets, decoding of the packets [1] and digital-to-analog conversion reproduce the original voice stream. Even though IP Telephony and VoIP are terms that are used interchangeably, they are actually different; IP telephony has to do with digital telephony systems that use IP protocols for voice communication while VoIP is actually a subset of IP Telephony. VoIP is a technology [2] used by IP telephony as a means of transporting phone calls. VoIP systems employ session control protocols to control the set-up and tear-down of calls as well as audio codecs which encode speech allowing transmission over an IP network as digital audio via an audio stream. The codec used is varied between different implementations of VoIP (and often a range of codecs are used); some implementations rely on narrowband and compressed speech, while others support high fidelity stereo codecs. There are three types of VoIP tools that are commonly used; IP Phones,Software VoIP and Mobile and Integrated VoIP. The IP Phones are the most institutionally established but still the least obvious of the VoIP tools. The use of software VoIP has increased during the global recession as many persons, looking for ways to cut costs have turned to these tools for free or inexpensive calling or video conferencing applications. Software VoIP can be further broken down into three classes or subcategories; Web Calling, Voice and Video Instant Messaging