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We'd like to keep this list updated with the latest information. If you know of a service provider that can offer a SIP service 'today', please provide a link and description of the service here.
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Lamsre Informatics Limited is a leading systems integrator and SIP-based communications application service provider (CASP) based in Dhaka, Bangladesh. Lamsre specializes in the integration of SIP-based communications systems tailored to service providers' unique needs. Lamsre Informatics Limited basic and enhanced SIP and IAX -based telephony service, number resolution, and advanced billing and subscriber administration through a hosted network model.
Lamsre Informatics is presently offering commerical trial SIP and IAX (Asterisk) services in Bangladesh, Saudi Arabia, Vancouver (Canada).
Level 3 Communications - Level 3 offers advanced wholesale voice services, terminating voice traffic via its dedicated IP backbone to gateway locations worldwide. SIP signalling is offered as part of this service. Customers of (3)Voice will have the opportunity to develop their own Application Service Provider and enhanced services over the open architecture of a SIP-based network.
(3)Works. Level 3 has created a self-certification program that allows VoIP equipment and service providers to interoperate with the Level 3 (3)Voice network. Participants will execute test plans relating to SIP signalling and RTP transport.
Light-Connect is a Ukranian SIP provider. Full SIP service - VOIP service; Free Web Calls; Free PC-to-PC sip service; Prepaid PSTN service
Link2VOIP.com - SIP VOIP provider. 800; local and international numbers available
Lucky Telecom VoIP Termination - Wholesale SIP A-Z VoIP termination services.
M2 Communications - SIP Origination services for US 48 $0.0025
M G S - UK Provider of SIP phones and SIP internet call service. Free UK numbers and ulta low call costs
M5 Networks; Inc. - M5 is a leading SIP-based IP phone system provider. Outsourcing to M5 instead of buying a phone system and signing more local & long distance contracts saves businesses valuable time and hard dollars.
MAXATEL - free subscription; free softdialer or use your own sip device; instant creditcard payment(SSL) and low rates!
MAXATEL - Iscrizione gratis sia per uso privato che per negozi di telefonia. Potrai avere un softphone gratis o usare il tuo apparecchio sip. Pagamenti instantanei con carta di credito (128 bit SSL). Chiamate in tutto il mondo a basso costo! (servizio prepagato, nessuna bolletta telefonica)
MCI - One of SIP's major advocates is Henry Sinnreich of MCI, so it's no surprise that MCI is a great proponent of SIP services. Its suite of business services, IP Communications, will enable businesses to move their voice traffic to an IP network and take advantage of a new generation of multimedia applications.
MCI customers can move to an IP environment while maintaining their existing dial plans and IN features. Later this year, when the network moves to SIP signalling, IP Communications customers will benefit from presence based services, instant conferencing and unified messaging. Users will be able to inform callers of their availability and preferred method of communication, such as email, telephone or instant message. Presence will also enable users to instantly set up chat sessions and audio-conferences.
McLeodUSA - McLeodUSA is among the largest US CLECs. The company's SIP Trunking product delivers integrated voice/data/Internet to IP-PBX. 6 to 50 voice paths per single T1. Bandwidth ranges from 1.5 to 45 mbps.
Mconnect; Inc. - A US SIP based VoIP service provider offering residential; premium/SoHo; and business unlimited; full-featured calling packages at affordable rates.
MeaPhone - MeaPhone is a SIP based phone service that works over Mobile; Landline and PC. It offers extremely low rates to non SIP accounts and allows free calls between SIP users. Use it with FRING and X-Lite
MediaRing.com, Inc. - MediaRing Talk”. MediaRing Talk offers SIP-based PC-Phone and PC-PC calls and XMPP based Instant Messaging & Presence. SIP-based 5 user conferencing too.
Messagenet - Carrier-grade SIP VoIP service provider based in Italy with DIDs availeble in many European countries.
MichTel Communications; LLC - MichTel provides wholesale SIP origination and termination services. Broadband phone service is also available.
MinuteHub - MinuteHub is an international VoIP hub that makes it easy to purchase wholesale VoIP termination and place international calls via SIP and H.323 VoIP equipment.
Minute Traders - Minutetraders.com is an online marketplace serving the SIP and VoIP community. With Minute Traders Buy or Sell your VoIP/TDM routes to a worldwide audience.
Mobitus - Based on industry standard Session Initiation Protocol (SIP) technology, mobitus allows consumer and enterprise customers to enhance the value of their internet connections, whether it is WiFi, broadband or dial-up based.
MondoTalk - Quality SIP VoIP calls at low rates. Specialled plans for US; Canada; UK; Australia and New Zealand; e.g. US/Canada 1000 min at only US$14.95. NO monthly access fees; connection fees and contracts.
Mutualphone - Compatiable with any SIP phone, such as Sipura, ATA186, Granstream. lower than Net2phone/Go2call. Instant account delivery Free USA incoming number/Voice mail
myPhoneCompany - myPhoneCompany's SIP to PSTN calling plans are further lowering the telecommunications costs for both residential and commercial customers.
mywebfon - SIP provider with low calling rates and best CLI white routes to Malaysia.Includes IP Phones; IPPBX; call termination; sip trunk; did in Malaysia
Nadiz International Investment Inc. - Free SIP service; Free Long Distance Calls! Nadiz is a free International SIP registrar. Nadiz telephony service allow you to make FREE from per minute charge calls to 50+ destinations in the world.
Navigata - WebCall by Navigata is ideal for busy families who require a second phone line, people who regularly communicate with family or friends in a WebCall served area or people looking for an economical communications tool. The service, which runs on Nortel Networks Multimedia Communication Server (MCS) 5200 platform, will allow high speed internet customers from anywhere in Canada to select a phone number from any WebCall location, a set of enhanced features and a long distance package.
(NBTS) No Border Telecom Services - Wholesale SIP based telecom provider with direct routes to almost all Balkans region (Albania; Greece; Bulgaria; Romania etc). Premium quality; low rates wholesale termination services.
NCIC Operator Services - Provides SIP enabled telepohone operator services and directory assistance for the LEC and CLEC markets.
Net2Phone, the pioneering VoIP service provider, has announced it will implement a SIP solution, allowing it to develop more advanced services.
Net4 - Full SIP VoIP solution including PC2P; Devices; 2nd & 3rd tier resellers; private label; callshop solution
Net International - Net International provides origination and termination of VOIP calls through analog telephone adapters (ATA) based on SIP. We offer direct inward dialing ( DID) with area codes from most major US cities and competitive inernational rates.
Netplan - We are a High Quality SIP and H323 terminating service providor based in the UK - offering high quality termination on multihomed teir 1 Network.
Nettel Telecom International - Nettel Holdings activated a new SIP-based IP telephony network and plans to launch a worldwide broadband phone service. Nettel plans to offer an unlimited calling plan to anywhere in the United States for $29.95 per month. Ordinary telephones could be connected to a broadband connection using a Cisco Systems' Analog Telephone Adapter (Cisco ATA) or other SIP-enabled device. Nettel is based in Vancouver, Washington.NextGenFone - NextGenFone mission is to deliver the benefits of choice, to simplify communications using broadband solutions for access, Nextgenfone service allows customers to make and receive phone calls anywhere in the world using SIP technology.
nexVortex is a next generation telecommunications provider for small and medium businesses. Our technologies, based on SIP standards, allow us to deliver advanced communication services and in turn give businesses better and more efficient ways to collaborate. Our SIP Trunking service is specifically designed for businesses with an IP PBX or TDM PBX to leverage our IP infrastructure obtaining low cost calling to traditional phones and free calling to other users of nexVortex service. We allocate toll free or virtual telephone numbers (almost any area code in the continental US and Canada) for inbound calling.
Network Intelligence - Managed Network Access Services. Wholesale SIP Trunking: SIP Termination and Origination; Least Cost and Performance based Routing; Outsourced Network Operation; Carrier Contract Management.
nikotel is located in San Diego, California. As a team of international professionals, we are committed to build the next level of digital communication by developing and adhering to the highest standards of VoIP communication, SIP and H323 Protocols.
NORBY Telecom - Pan Baltic SIP VoIP service provider. VoIP solutions for Business customers. IP PBX production; deployment; service.
NovaTel is the first VoIP carrier to have an H323, SIP and SS7 integrated network. As a beta-tester for both Verisign (for the next generation of SS7) and Cisco, our customers can count on us to deliver the most advanced VoIP network capabilities.
nPlusOne - SIP/PSTN termination and ipCentrex with VoiceXML mediaservers for xSP channels.
Octopus IP Communications - $19.99/month (plus taxes) gives your office extension a connection to the Hosted IP-PBX and SIP Communications Server; local calling; corporate webmail service and standard business phone features
OnSIP - Totally customizable SIP service provider for small-medium business which provides free internet to internet calling; free SIP domain hosting; and unlimited free extensions.
Openface Internet - Hosted PBX service; multiple models of SIP Phones; SIP trunking service; virtual calling card service; click-to-call service; Smooth migration of Legacy PBX to VoIP; SHDSL; Fiber.
OpenTone Communications LLC - A VOIP company (SIP) offering affordable rates for both businesses & residential. OTC market VoIP services throughout the Philippines; Asian countries; US; Canada; Europe; and Middle East.
Orbitel is the first competitive telecom in Bulgaria, after the end of national monopoly. The company's convergent platform provides unique business opportunities in the opening national market of voice and data services. Orbitel will deploy NetCentrex multi-protocols platform, using simultaneously H323, MGCP and SIP protocols.
Packnet Limited - Business SIP provider based in Manchester, UK, delivering IP telephony and telecommunications systems that small to large business require.
Pandora Networks - Worksmart Hosted Service, the first complete IP Centrex service with virtual PBX, video, universal instant messaging, and collaboration for complete communications solutions for small and medium enterprises.
Paradial - RealTunnel(TM) v0.9.8 The public service so far has supported Windows Messenger and MSN Messenger used in combination with the .NET Passport service. Today full blown SIP Registrar service is launched. This means that all SIP clients behind NAT and firewall devices now can establish voice and video calls. RealTunnel users can connect to their existing service provider (e.g. Iptel.org, Free World Dialup), or sign up for a free SIP ID from the realsip.com domain provided by Paradial. The SIP service will be denoted RealSipTM. For further instructions on how to test the SIP capabilities (RealSip(TM)) of RealTunnel(TM), see http://www.realtunnel.com/index.jsp?page=Sip. The following SIP clients can be synchronized automatically with the RealTunnel(TM) clients: Windows Messenger, X-Lite, X-Lite FWD and eConf.
Peneo Telecommunications - Peneo is a leading-edge technology firm specializing in VoIP solutions to lower telecom costs for residential consumers and commercial businesses. SIP hardware welcome!
Phoneserve - High Quality Calling Card Product via SIP Softphone or Gateways
Phontel Telecom Inc. - Phontel Telecom Inc. offers worldwide telephony services using conventional circuit-switched and IP telephony. Our services: SIP phone; Voice DID Worldwide; Call back and Wholesale at competitive prices.
Pincity - Use Pincity's prepaid Phone Cards to make low-cost calls anywhere in the U.S. and from the most frequently called countries worldwide. Pincity's Phone Card comes with sip SERVER.
Prelude Voice Technologies; Inc. - Wholesale SIP trunking and Hosted Call Center service provider in the US that offers affordable hosted VoIP/SIP solutions.
PT.Cyberindo Aditama (CBN Internet) - Indonesian SIP service provider; their product name is CBNTalk; using their prepaid card; we get account to connect to SIP server
QuaesTel; Inc. - QuaesTel's network provides CLECs; ISPs; Interconnects/Integrators and Municipalities with the unique ability to provide their customers with a systematic; non-intrusive migration VOIP SIP technology.
Reuters Messaging is a real-time communications tool designed to meet the needs of professionals in the financial industry. Easy-to-use instant messaging gives your users immediate access to their key market contacts anywhere in the world, with SSL encryption and message logging to ensure that their conversations remain confidential and compliant with current financial services regulations.
Ritaj Telecom Systems Ltd. - CLI routes; premium SIP routes: Egypt Bangladesh; India; Pakistan; Philippines; Saudi Arabia; SriLanka; UK; UAE; Yemen; Afghanistan; Bahrain; Jordan; Kenya; Turkey; Sudan; Kuwait; Iran; Nepal; Qatar; Syri
Rubicon IPNet - SIP Service
h h h h h h h h h h h h h h hSeednet - Seednet is expected to be the first Internet Service Provider (ISP) in Taiwan to provide advanced SIP Session Initiation Protocol (SIP)-based multimedia services.
Sinapsys - Service of unlimited calls for SIP; free calls between users registered; entry of DID in several countries.
SIP Talk - Call any SIP phone in the world for FREE! Get your friends on SIP Talk and never pay long distance or local phone service again.
Sip2go - Providing broadband voice services with free adaptor and softphone. Sip to PSTN termination. Inbound numbers using ENUM and UPT ( 87810)
sipbroker.com - Setup a SIP Broker number like 1-555-1234 to map to your existing SIP URI and your friends and family can call you by simply dialing this number.
SIPCarrier - SIP termination provider offering FREE full featured reseller platform. Create and control pre-paid and postpaid accounts (calling card PINs) through our fully hosted solution.
sipgate - sipgate is a sip service provider that supplies geographic phone numbers throughout the UK; Germany and Austria.
SiPnumber - SiPNumber.com offers a FREE US phone number that offers unlimited in-bound calling. SiPNumber.com works with ANY SiP device and service. SiPNumber.com also offers a free softphone and 60 free minutes!
SipPal.com - VOIP Consumer Service with SIP access. No monthly fee. Free 0870 numbers. 020 and 01 Numbers coming soon.
SIPPhone - SIPphone makes it possible for people to send and receive free calls worldwide. Just plug in a SIPphone or regular phone with a SIPadaptor into a broadband Internet connection, dial the desired SIP number, and start talking.
SipTelecom - Allow site owners accept SIP video calls from their web site.
SiptelNEt - SIP ITSP; providing corporte with high quality voice solutions; from ivr to termination.
sipzoo.com - SIPZOO is a comprehensive global Broadband Telephone service. After signing up with SIPZOO, the customer receives a regular local U.S telephone number. The telephone number provided by Local Number has the same features and options that are currently available with any local telephone company.
skysiptel - Cheapest VoIP; Broadband phone; Free Softphone PC2Phone; sip proxy
Smoothstone IP Communications - A fully managed SIP solution with support for a wide range of network carriers and PBX systems; along with business continuity tools; trunk pooling capabilities and centralized call recording.
SoTel Systems LLC - SoTel has three distinct SIP Service offerings that are designed to deliver flexible; yet cost-effective voice services for both the small and large customer.
Speedflow Communications Ltd. - Speedflow Communications is Wholesale/Retail(SIP/H.323) VoIP services and Voip solutions provider. Company was faounded in 2004 and it's head office is in UK.
Stanaphone - Free simple and easy to use internet telephone. Stanaphone is a SIP based service. Any SIP device can work with a Stanaphone account.
Stage2Networks - SIP-Based Hosted PBX/VoIP Service provider - Providing On-Net/Off-Net Hosted/Managed PBX and SIP Trunking products
Startone Telecommunication Sdn Bhd - SIP Termination; discounted call; Softswitch billing and application; bulk traffic purchase; ATA equipments; share computers
Sunday A major wireless provider in Hong Kong
Sunline - We connect customers worldwide to our international VoIP network using SIP and H.323 and we also assign virtual western European telephone numbers.
SuperNetTel - Providing Internet Telephone related services since 2002. We now focus our attention on resellers worldwide. We still provide SIP and IAX services to consumers worldwide. We terminate through TDM.
Sure Telecom - Cheap calls Worldwide; SIP Server; IP PBX Systems; Innovative solutions; International phone numbers; Multiple extensions; Conference calls; Call recording; Good quality; Free trial; Register Today!
Switzernet.com - A swiss SIP service provider. We provide SIP <-> PSTN communications, with a regular swiss PSTN phone number (021 and 022). Calls are FREE of charge to PSTN in Switzerland, France, UK, Germany, USA and Singapoure (for private customers).
TalkBD - ITSP offering High Quality Calls via SIP Softphone or Gateways
Talkfree - Talkfree is the provider of choice for prepaid SIP calling in the developing world. Our portal is built in 9 languages and features every IP access technique. Talkfree has 4000 resellers and agent.
TalkingNets, a telephony ASP, provides wholesale telephony solutions that allow an ecosystem of carrier and value-added reseller channel partners to offer next generation voice services to small and medium-sized businesses. TalkingNets provides a complete portfolio of services ranging from local dial tone service to hosted virtual PBX applications.
TalkTT.com - Provide cheap phone call services from Computer or any SIP compatible adapter/softphone/mobile - TalkTT.com
Tandem Transit - Tandem Transit provides SIP origination and ENUM registration of your DIDs. You can also purchase DIDs throughout the USA. Tandem Transit is partnering with carriers to provide Transit between CLECS
Tata Communications - IPVoice Connect is a converged; IP-based voice & data SIP Trunking service that offers unparalleled routing flexibility and service options specifically designed for both enterprises and call centers
Techland - Techland is VOIP Services; SIP; IP Telephony Service Provider; Unified Communications Solutions; Email archive and IP Telehpony Equipemet and Solutions Provider.
TechTerra - TerraCall(TM), a new SIP based long distance IP Telephony service for calling landlines and cell phones worldwide.
Telasip offers US-48 SIP origination and A-Z SIP Termination to the residential; business and wholesale markets.
Telecom Matters Corp. - Provides hosted PBX services to small/medium business--all you need are SIP-enabled phones/LAN. Live answer; auto-attendant/IVR; voice mail; call queues; conferencing; DID numbers; fax-to-email; etc.
Telekenex - Telekenex SIP Trunking uses our private MPLS network to deliver the best voice quality and reliability. A single IP -based connection back to our private network; no longer need local PSTN or circuits
TeleSIP offers SIP Telephony services to end users in the US and Latin America. We provide standard ATAs with US DIDs or private numbers.
Telia - The Golden Gate project was initiated in 1999 to design a platform for services that could bridge the gap between different networks. The basis for this project was a SIP network architecture and SIP-enabled services. A gateway was built between traditional networks and Telia's new IP network. Number portability was chosen as a pilot service to keep track of the current phone number of a user as they change IP address.
Teliax - Full Service Residential; Corporate and Enterprise VoIP SIP and IAX service. Low cost Origination in 6500 US Exchanges and Global Termination. Virtual PBX platform; build-to-suit plans and more.
Televoip as - TeleVoIP Communications IP telephone SIP provider from Norway, with pay as you go, online telephone numbers.
Telopar; Inc - Providing SIP connectivity for residential and business users; as well as termination services for SIP server operators
TELUS - At the heart of TELUS' new packet-based national voice solution are Nortel Networks Succession Communication Server 2000 softswitches and Nortel Networks Passport Packet Voice Gateways (PVG). TELUS' national VoIP network includes voice gateways deployed at 11 major locations across Canada, enabling voice traffic to be carried on TELUS' national high-speed IP backbone with carrier grade voice quality.
TELUS is trialing Nortel Networks Succession Interactive Multimedia Server for delivery of SIP-based personalization, collaboration and other multimedia services.
TerraSip SA - TerraSip is listed TOP 10 in the WORLD! Members call each other all over the world for free. Enjoy free and cheap phone calls to other networks with TerraSip; the mobile VoIP Community.
Termilink Digital Voice - SIP Residential Provider in US.Unlimited US and Canada Plans. Great International rates and Virtual numbers.
Terravon Communications - SIP provider offering A-Z Termination; Origination for US; Canada; Brazil; and 23 other countries. Toll free numbers; ITFS; UIFN services too; provided via SIP; H.323; and IAX.
Timico - Timico are the first SIP service provider to offer a complete communications bundle to the business market. As an ISP and a Mobile Virtual Network Operator timico have a fully converged SIP offering.
Top Savings Telecommunications - SIP provider consulting and comparison to help your business make the best decision and purchase. Free consulting and price searches for SIP trunk services. 1-888-259-6113
TRACI.net provides SIP origination and termination as well has hosted PBX services. Flat rate Toll Free DIDs are available for $10/month with no additional per minute fees.
Trillium Solutions - Trillium "Talk Infinity" has built a core "converged" voice and data network that utilizes the session initiated protocal (SIP) standard to create opportunities that reach far beyond "cheap long distance" and standard telephony features to provide Local phone service affordable.
Tseyva.com - Tseyva offers true hosted PRIVATE labeling for SIP / H323 PC2Phone; Device2Phone; IP Phones and Calling Cards for voip resellers. We offer Extreme Support; Exceptional Quality & Extraordinary Stability
TuliP Telecom - Use your SIP phone/gateway/soft-phone to make/receive phone calls to/from anywhere in the world. DID numbers available from: France, Canada, Taiwan and soon many others.
Tut Telecom - Tutankahmun Telecom leader in PC 2 Phone services.SIP origination and termination; with over 600 interconnecting carriers worldwide; providing you with great connection and cheap rates.
Vaspian - Vaspian is an integrated service provider (cooperative), offering a suite of hosted telecommunications (SIP based) applications to small and medium sized businesses through out the Northeast. The Buffalo based firm offers a unique local, long distance, Internet Key/PBX system that displaces the need for the business telephone system.
VCOMM UK Ltd - VCOMM are the hosting partner to Pandora Networks in the UK & Ireland. Selling exclusively via channels; VCOMM offer 'soup to nuts' provisioning of Pandora's award winning SIP platform.
Verizon - Verizon's initial launch will be the largest in the industry. It will sell an Internet SIP-based service in 139 markets in 33 states, many of them outside of Verizon's territory.
Vircoms - Cheap International Calls-paypal and credit cards accepted- rates negotiable per volume we also support telephone adopters and calling cards gateways
vNet Source - Providing wholesale VoIP infrastructure (ISP's) with 50,000 ports nationwide.
VoEx is a leading provider of high quality Internet telephony services with first tier quality that enables telecommunications carriers and other communications service providers to offer international voice, fax and other value-added applications over the Internet.
The Voice Peering Fabric - A distributed Layer 2 Ethernet Fabric, allowing VoIP organizations to Buy & Sell minutes among one another directly.
Voice Stream Data - Voice Stream Data proudly offers virtual calling card providers and Sip VoIP service providers a strong global network in which to connect to almost any destination in the world.
Voicebanker.com - Voicebanker.com provides sip communications from regular PSTN phones and through its Plug&Phone sip client adapted to usb stick memory.
VoiceConX IP LLC - VoiceConX delivers a fully managed & hosted IP Telephony Solution using SIP; add Internet Access & small and medium size businesses receive all Voice & Internet Service from One Company & one bill.
VoiceFlex - SIP Service provider. Number porting; DDI ranges and SIP trunks.
Voiceglobe - Global Internet Telephony provider based on advanced SIP infrastructure in USA and Europe. SIP services provided to retail and wholesales market; supporting "white label" virtual ITSPs worldwide.
VoicePulse - Broadband Phone Service
voicetrading - SIP to PSTN wholesale termination service provider; offering cheap international calls to small & medium size businesses. Easy setup & acccount management; crystal clear connections; excellent rates!
Voipax - Voipax offers cheap or even free phone calls worldwide using SIP protocol. Use your own SIP device or download the free Voipax client. Cheap rates to more than 200 countries. Free signup.
VoIPCall Secure provides encrypted calling around the world using SIP IP Phones connected to our network. Unlimited encrypted phone to phone calls around the globe. Unlimted US & Canada calls
VoIPCall - Providing business VoIP SIP origination & termination services.
US & International termination & US; Canada & UK origination services
Voipgate - SIP compliant VoIP Termination for the Netherlands and VoIP gateway services for VoIP Servers
Voipfone - Voipfone provides reliable and inexpensive sip telephone calls and advanced switchboard services to anybody; anywhere in the world.
VoIP Innovations - VoIP Innovations provides inbound DID's and termination in the US48 and north america all via SIP. We warehouse over 100; 000 DID's and provide coverge in over 7; 500 rates centers.
VoIPInvite - SIP to PSTN wholesale termination service provider. Under a penny termination to the US 48 states and Canada. TDM (TOLL/Land Line) quality; 90+% ASR; 1-2s PDD. Use our product as a backup if you wish.
VoIP Service - Make Cheap Calls phone with the best VoIP provider service; phone free of charge or for cheap rates via the Internet with SIP Softphone
VoIPTREX LLC - We are a true SIP base ITSP out of Santa Clara
VoIP User - UK VoIP resource and PSTN to SIP termination service provider.
Vonage Digital Voice - Through SIP and VoIP gateway's, we have essentially brought together the two biggest networks in the world, the PSTN and the Internet. It is the most dynamic, efficient and cost-effective means of communicating and is now available for you to use to your advantage. That is the essence of SIP-thru-NAT, Vonage's proprietary communications technology.
Voxbone - Voxbone is the world's first and largest provider of worldwide virtual phone numbers (DID's). Order a number from any major country in the world and receive the calls via SIP; wherever you are!
VoX Communications - SIP origination and termination services for cable operators; carriers; ISPs; CLECs; resellers and other wireless operators as well as VoIP telephone service to residentail and SOHO customers.
Voxitas - Voxitas is SIP provider with Quality of Service (QoS) Business-Class ITSP (Internet telephony service provider) offering service nationwide. Services are sold via agents/VARs for residual income.
VOZ - Puerto Rico's SIP based VOIP provider; offering Corporate (SIP Trunking/Virtual PBX) and Residential communication services.
VozTelecom - vozIP.com is a white-label SIP enabled architecture for ISPs; ITSP; broadband and voice providers; to deploy IP Telephony applications over an ASP model; reducing time to market; capex at zero risk.
Webacall.com - SIP based VoIP Services. VoIP; Virtual Calling Cards; DID numbers; Callshop Applications; Reselling Options
WebPhone - Provider of SIP based softphone with a wide array of features and benefits: Free PC to PC calling; low cost PC-to-Phone calls; online account management; unlimited incoming calls and voicemail.
WebUnited, Inc. - WebUnited offers a unique (SIP) based voice over Internet protocol (VoIP) telephony solution that offers the immediate benefits of reduced operating expenses and improved productivity over traditional RBOC telephone lines and PBX telephone systems.
Welcome Telecom - Service provider with SIP, H323 terminations capability
WholesaleSIP - Dedicated SIP termination to 90% of California at $0.00475 USD
World Venture Group Telecom - Providing World Wide SIP/H323 Terminations
Yesfone Inc - Full service SIP provider - free member to member calling and cheap long distance call.
Your Sip Inc. - Nationwide Origination and Termination. Toll Free. Business and Residential VoIP. Total Care services for Tampa Bay; FL customers. Providing VoIP services since 2000. UNLIMITED FEATURES. SIP/IAX.
ZGroup North America - ZGNA markets enhanced (SIP) VoIP services, products and network solutions to corporate and individual customers worldwide. The most reliable, efficient and cost-effective means of communicating.
ZONE Limited - HK DID / PSTN Number via SIP China DID Number and China Toll Free Number
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