3CX to Feature Latest Version of its Phone System for Windows at INTERNET TELEPHONY® Conference & EXPO East 2008 in Miami
INTERNET TELEPHONY Conference & EXPO is the world’s largest and best-attended IP Communications trade show. Last year’s East coast event, held in South Florida in January, drew over 7,000 buyers and sellers of IP Communications products and services. The upcoming show in January will be the 17th INTERNET TELEPHONY Conference & EXPO, and TMC projects total attendance to exceed 7,500 communications unifiées . “3CX IPBX participation at INTERNET TELEPHONY® Conference & EXPO exemplifies why this show is widely recognized as the #1 venue where service providers, enterprises, government agencies, developers and resellers gather to learn about the benefits inherent in IP Communications products and services,” said Rich Tehrani, TMC President. “The evolution in this industry has been monumental and it still continues to grow. We are proud to have 3CX and 3CX Phone System for Windows as a key part of this year’s program.” 3CX Phone System for Windows is an award-winning software-based IP PBX that replaces traditional proprietary hardware PBX. It is entirely SIP-standard based, and therefore interoperates with most popular SIP phones, SIP VoIP Gateways and SIP VoIP providers. It frees businesses from the shackle of hardware-based proprietary phone systems and is very easy to manage by system administrators as it integrates well with Windows Network infrastructure. 3CX Phone System for Windows won a “Best of Show” Award at Technology Marketing Corporation (TMC®)’s INTERNET TELEPHONY Conference and EXPO West 2007, which took place in September 2007. “We are excited to be participating as communications unifiées as exhibitors at INTERNET TELEPHONY® Conference & EXPO as this is a great opportunity for us to promote our innovative product. We have just launched version 5 of 3CX Phone System for Windows with a set of features that help businesses give employees mobility, rids them of costly telephone tag and reduces administration and training time by IT staff. We look forward to meeting the key players in the industry who will attend the event and to promoting our product to them,” said Nick Galea, CEO 3CX. Registration for the show is now open. Anyone interested may register by visiting www.itexpo.com. About 3CX 3CX is an international developer of telecommunications software, headquartered in Europe with offices in Cyprus, USA, UK and Hong Kong. It is a Microsoft Gold Certified partner and is backed by an experienced management and development team. The IPBX company is focused on the Windows IP PBX market with its innovative 3CX Phone System for Windows, which has been developed specifically for the SMB market. For additional information on 3CX please visit www.3cx.com. About TMC® Technology Marketing Corporation (TMC) publishes four print publications: Customer Interaction Solutions, INTERNET TELEPHONY, SIP Magazine and IMS Magazine. TMCnet, TMC's Web site, is the leading source of news and articles for the communications and technology industries. Ranked in the top 1,600 sites in the world by alexa.com*, TMCnet serves more than one million unique visitors each month. TMC is also the first publisher to test new products in its own on-site laboratories, TMC Labs. In addition, TMC produces INTERNET TELEPHONY Conference & EXPO, Communications Developer Conference, VoIP Demo, IMS Expo and Call Center 2.0 Conference. TMCnet.com publishes more than 15 topical online newsletters. For more information about TMC, visit www.tmcnet.com. (*alexa.com is an Amazon.com company that ranks Web sites by their traffic levels. Neither alexa.com nor amazon.com is affiliated with TMCnet.) |
Thursday, December 20, 2007
Meet us at INTERNET TELEPHONY® Conference & EXPO East 2008 in Miami
Monday, December 10, 2007
3CX and XeloQ Communications announce partnership that will provide businesses with an integrated VOIP Solution
Nicosia and Hoofddorp – 10/12/07 – 3CX, the international developer of the leading IP PBX for Windows, and XeloQ Communications, a professional VOIP service provider from The Netherlands with worldwide operations, announced today that they have joined forces to provide small and medium sized businesses with a complete VOIP telephony solution.
The fully integrated solution for PABX, which uses VOIP and SIP technologies and incorporates the many advantages of 3CX Windows-based IP PBX with the services of a reliable VOIP provider such as XeloQ, is aimed at helping businesses increase employees mobility and productivity while reducing costly telephone tag.
Nick Galea, CEO at 3CX said, “3CX’s strategic partnership with XeloQ Communications equips companies with an outstanding VOIP solution. Since full interoperability testing has taken place, businesses can use 3CX Phone System with XeloQ VOIP services confident that the solution will work well and that the two partner companies stand behind it”.Milko van den Wollenberg, Managing Director at XeloQ Communications said, "We are excited to have 3CX as our partner. Their product offers a set of features that no other IP PBX has, and its simple technical configuration and ease of use is exactly what we need to offer our customers a productivity enhancing and cost-saving VOIP solution for their business’ communications”.
The telephony solution for PABX provided by 3CX and XeloQ delivers free unlimited calls between offices, very competitive international rates, no annual contracts, no need for changes to current infrastructure, worldwide DID services and group numbers for easy office-to-office connect. All this is combined with an award-winning, Windows-based and open standard PBX that is extremely simple to install and configure and yet includes a sophisticated set of enterprise level features.About 3CX
3CX is an international developer of telecommunications software, headquartered in Europe with offices in Cyprus, USA, UK and Hong Kong. It is a Microsoft Gold Certified partner and is backed by an experienced management and development team. Its product, 3CX Phone System for Windows, has earned Windows Server 2003 Certification and has received numerous awards, including the TMC Labs 2007 Innovation Award, The Windowsnetworking.com Gold Award, as well as, the IT EXPO Best of Show award 2007, all in recognition to the company’s commitment to innovation and quality. 3CX maintains a global presence with offices in four countries and localized information available in German (http://www.3cx.de), Spanish (http://www.3cx.es), French (http://www.3cx.fr), Italian (http://www.3cx.it), Portuguese (http://www.3cx.com.br), Japanese (http://www.3cx.jp), Simplified Chinese (http://www.3cx.cn) and many other languages. 3CX keeps a comprehensive IP PBX, SIP and VOIP FAQ on its website covering all the most common questions on the topic.
About XeloQ Communications
XeloQ Communications is a VoIP provider operating in the International VoIP arena since 2002 and has the technical & commercial people and skills to support whatever is possible in the exiting world of the Internet Telephony. We run our operations and NOC's from the Netherlands, Venezuela and Ukraine so we have support departments covering different time zones. We deliver VoIP and Internet Telephony to worldwide consumers, small and medium businesses and enterprise customers. Our main strategy is to serve our (branded) resellers (currently 80 resellers in 29 countries) and B2B customers. Businesses and resellers are welcome! More information: http://www.xeloq.eu
Thursday, December 6, 2007
3CX Proves That Soft Is Better Than Hard - When It Comes To Phone Systems
London, UK - 05/12/07 – 3CX has announced the release of version 5 of 3CX Phone System for Windows; the newest version of their award-winning software-based VOIP PBX for Windows which helps businesses give employees mobility, rids them of costly phone tag and reduces administration and training time by IT staff.
3CX Phone System allows businesses to completely break free from the shackle of hardware-based, proprietary phone systems. Built on the open SIP standard, 3CX Phone System interoperates with all popular SIP phones, VOIP Gateways and VOIP providers.
Nick Galea, CEO at 3CX said, “We are excited to deliver version 5 of 3CX Phone System at a time when the market is realizing that proprietary, hardware-based PBXs are becoming obsolete. 3CX IP PBX is a modern software based PBX that evolves the communication of businesses to the 21st century, by delivering mobility, productivity and cost-saving advantages”.
Key advantages of adopting 3CX Phone System / telefonközpont :
- Increases mobility – allows remote workers and tele-workers to be seamlessly integrated to the company’s phone system
- Eliminates expensive telephone tag using the inbuilt Presence feature
- Easier phone system administration via a web-based configuration
- Vendor independent – significant cost savings by choosing VOIP provider and SIP equipment of choice
“The feedback we have received from clients following the successful deployment of our previous versions in thousands of sites is very positive, and I feel confident that with all the great new features that we have incorporated in this new version, our product will help SMBs get even more advantages out of the migration to a software based PBX in a cost-effective and innovative way”, added Nick Galea.
Key new features of 3CX Phone System v5:
- Call recording – easily record calls for monitoring purposes
- Phone provisioning – set-up new extensions automatically
- Firewall friendly VOIP client with included mini VPN – ideal for remote users
- Integrated fax server
- G729 codec support
- 3CX bridges for branch offices
- SIP Trunking support
And many other features that make 3CX Phone System easy to install, configure, manage and use; allowing employees to increase mobility and productivity.
Four available editions: Free, Small Business, Pro, Enterprise and Free
3CX Phone System for Windows is available in four editions, all supporting an unlimited number of extensions: The Small Business edition supports up to 8, the Pro edition up to 16 and the Enterprise edition up to 32 simultaneous calls. Pricing is very competitive: Small Business costs €375, the Pro runs at €795 and Enterprise costs €1150.
3CX Phone System Free edition
A Free edition, supporting an unlimited number of extensions, is also available. The main differences with the commercial editions are that it is not possible to buy a support package for the Free edition, it does not offer fax, call queuing, Exchange 2007 support, call pick up and call parking, MWI, presence (to check extension status of other users), remote configuration of extension options, G729 codec support, 3CX Bridges (to connect remote branch offices) and call recording. Not withstanding, the Free edition does more than most commercial PBXs for Voip do; it includes an auto attendant and Unified Messaging. The Free edition can be downloaded from http://www.3cx.com/phone-system/download-phone-system.html.
About 3CX
3CX is an international developer of telecommunications software, headquartered in Europe with offices in Cyprus, USA, UK and Hong Kong. It is a Microsoft Gold Certified partner and is backed by an experienced management and development team. Its product, 3CX Phone System for Windows, developed specifically for the SMB market, has earned Windows Server 2003 Certification and has received numerous awards, including the TMC Labs 2007 Innovation Award, The Windowsnetworking.com Gold Award, as well as, the IT EXPO Best of Show award 2007, all in recognition to the company’s commitment to innovation and quality. 3CX maintains a global presence with offices in four countries and localized information available in German (http://www.3cx.de), Swedish (http://www.3cx.se), Norwegian (http://www.3cx.no), Finnish (http://www.3cx.fi), Dutch (http://www.3cx.nl), Spanish (http://www.3cx.es), French (http://www.3cx.fr), Italian (http://www.3cx.it), Portuguese (http://www.3cx.com.br), Japanese (http://www.3cx.jp), Simplified Chinese (http://www.3cx.cn) and many other languages. 3CX keeps a comprehensive IP PBX, SIP and VOIP FAQ on its website covering all the most common questions on the topic.
Useful Links:
3CX website: http://www.3cx.com
3CX Case Studies & Testimonials - http://www.3cx.com/clients/index.html
3CX Phone System Free, Small Business, Pro and Enterprise editions comparison table - http://www.3cx.com/phone-system/edition-comparison.html
IP PBX, SIP & VOIP FAQ - http://www.3cx.com/PBX/SIP-faq.html
Nick Galea’s blog – http://www.nickonit.com
Tuesday, November 13, 2007
Housing Association to provide VoIP to residents
London-based Gallions Housing Association has installed wireless broadband from Motorola, with a view to eventually rolling out VoIP and IPTV services to its residents.
The housing association is currently trialling the solution, which provides affordable broadband to residents in its 150 multi-unit dwellings.
Many of the units are in high-rise blocks which would be expensive to connect to traditional broadband solutions.
Read the whole article here.
Thursday, November 8, 2007
3CX and InPhonex deliver a complete and reliable VOIP Solution by strategically joining forces
Nicosia, Cyprus and Florida, USA – November 8, 2007 – 3CX, the international developer of telecommunications software, today announced they have teamed with InPhonex, a leading provider of high quality internet telephony services and infrastructure, for end-users and service providers worldwide. The companies together now supply a fully integrated and highly reliable end-to-end business grade solution using VOIP/ SIP technologies.
Businesses already using 3CX VOIP PBX for Windows can now benefit from InPhonex’s internet telephony services for voice calls as an integrated solution, confident that there are no inconsistencies between the products. "As IP Telephony gains momentum, it is essential for providers to be able to offer a SIP VOIP solution that eliminates deployment challenges, such as reliability and interoperability," said Nick Galea, CEO at 3CX. “3CX’s partnership with InPhonex provides an excellent VOIP solution. Full interoperability testing has been executed, so customers can use our IP PBX with InPhonex internet telephony services knowing that the solution has been tested and that they have full support from both companies”.
"By working with 3CX, we are delivering a cost-effective solution to our customers that incorporates the best voice quality, seamless integration and interoperability into an existing IT environment”, said Todd Hirshorn, President, InPhonex, LLC. “The 3CX Phone System for Windows is a reliable product that is extremely easy to install and manage. The ease of technical configuration and features make the solution perfect for us and provide our business customers a fully integrated telephony solution”.
The solution allows for a choice of calling plans to best fit each customer’s needs. Each plan includes free calls to other InPhonex subscribers worldwide, prepaid "out of plan" calling with low international rates, and unlimited calling to the destinations they call the most for one flat monthly fee. Every account includes over 20 free features such as voicemail, callerID, call waiting and International call forwarding. This is combined with an award-winning Windows based IP PBX with features that make it easy to install, configure and manage, increasing productivity andenabling businesses to reduce their telecommunication costs and boost their profit margins. Some of the features and supported options are: SIP trunking, SIP proxy, VOIP Gateways, SIP server.
About 3CX
3CX is an international developer of telecommunications software, headquartered in Europe with offices in Cyprus, USA, UK and Hong Kong. It is a Microsoft Gold Certified partner and is backed by an experienced management and development team. Its product, 3CX Phone System for Windows, has earned Windows Server 2003 Certification and has received numerous awards, including the TMC Labs 2007 Innovation Award, The Windowsnetworking.com Gold Award, as well as, the IT EXPO Best of Show award 2007, all in recognition to the company’s commitment to innovation and quality. 3CX maintains a global presence with offices in four countries and localized information available in German (http://www.3cx.de/), Spanish (http://www.3cx.es), French (http://www.3cx.fr), Italian (http://www.3cx.it), Portuguese (http://www.3cx.com.br), Japanese (http://www.3cx.jp), Simplified Chinese (http://www.3cx.cn) and many other languages.
3CX maintains a good VOIP and SiP faq in several language, such as in German VOIP and SIP, French, Spanish, Polish, and other languages.
About InPhonex
Founded in 2003, InPhonex is a leading provider of proven, high quality Internet telephony services and infrastructure for business and consumer end-users and service providers worldwide. InPhonex offers solutions for virtual VoIP companies who want to become independent IP telephone service providers, through the VarPhonex Reseller Program, combing robust network infrastructure and leading edge services with the industry's most customizable private label package.
Headquartered in Miami, Florida USA, InPhonex is a privately held company with technical data centers in Florida and Virginia serving 150 countries. For more information, visit www.inphonex.com and the reseller program at www.varphonex.com.
Wednesday, October 31, 2007
Broadvox SIP Trunking Has Been Incorporated into Software Based IP PBX from 3CX
Users will be able to easily Order and Configure Broadvox SIP Trunking Products with the 3CX Setup WizardNicosia, Cyprus and Dallas, TX – 30 October 2007 – Broadvox announces it is one of the first ISPs in the United States to interoperate with 3CX, a completely Windows-based PBX system in a land of open-source, asterisk-based systems. Broadvox, a leading provider of SIP Trunking solutions to SMBs, Enterprises and Carriers has found the interface offered by 3CX to be extremely user-friendly telefonközpont.
“3CX has released a system specifically for Microsoft Windows® providing a tremendous level of integration with most IT infrastructures,” stated Eric Eckman, Director of Product Development at Broadvox. ”Further, the setup wizard, included with Release 4, makes the software-based PBX 3CX Phone system very easy to install and maintain”.
By simplifying setup customers will not only benefit from the cost-savings provided by Broadvox GO! SIP Trunking products, but will also save time previously spent installing, wiring and configuring their hardware-based PBX systems by using the 3CX software-based IP PBX. Users will also benefit from the Broadvox GO! SIP Trunking ease of administration via the SIP Trunking portal.“We are very glad that we have achieved interoperability with Broadvox SIP Trunking solutions, enabling our customer base to quickly reduce their telecommunications costs and increase their profit margins,” said Nick Galea, CEO of 3CX. “The combination of Broadvox SIP Offering and our IP PBX creates an excellent value and innovative solution for the SMB market.”
Broadvox GO! SIP Trunking delivers an uncompromising level of quality and service throughout the United States. The Network Operations Center is available 24x7x365, exceeding customers’ expectations for reliability, security and quality of service. Broadvox SIP Trunking features include, but are not limited to enhanced 911service, disaster recovery, multiple location interoperability and local number portability management.About Broadvox
Founded in 2001, Broadvox is a worldwide leader in providing integrated managed VoIP services to SMB, Enterprise and Carrier customers. It has deployed one of the largest, full-featured global VoIP networks and is trusted by more than 160 telecommunications carriers, CLECs, ISPs and over a thousand enterprises to terminate and originate over six billion minutes annually. The Broadvox network operations center provides the reliability, security and quality of service required by the world’s most discriminating customers. Broadvox offers SIP Trunking, SIP origination and termination services and hosted communications solutions. Broadvox is headquartered in Dallas, Texas. Please visit www.Broadvox.net for additional information.
3CX is an international developer of telecommunications software, headquartered in Europe with offices in Cyprus, USA, UK and Hong Kong. It is a Microsoft Gold Certified partner and is backed by an experienced management and development team. Its product, 3CX Phone System for Windows, has earned Windows Server 2003 Certification and has received numerous awards, including the TMC Labs 2007 Innovation Award, The Windowsnetworking.com Gold Award, as well as, the IT EXPO Best of Show award 2007, all in recognition to the company’s commitment to innovation and quality. 3CX maintains a global presence with offices in four countries and localized information available in German (http://www.3cx.de/), Spanish (http://www.3cx.es), French (http://www.3cx.fr), Italian (http://www.3cx.it), Portuguese (http://www.3cx.com.br), Japanese (http://www.3cx.jp), Simplified Chinese (http://www.3cx.cn) and many other languages.
3CX maintains a VOIP and SIP FAQ in several languages, which includes information about SIP trunking, SIP proxy, VOIP Gateways and others. Some of the languages include: VOIP in Swedish, SIP FAQ in Portuguese, in Norwegian, and Danish.
Wednesday, October 17, 2007
3CX and Portland Europe Partner to Enter Benelux IP Telephony Market
Step-by-step installation dialogs ensure quick installation and easy maintenance. The 3CX Telephone System elmininates telephone cabling because it uses the existing computer network.
3CX Telephone System main features:
- Complete telephone system, including call transfer, inbound routing and call queues
- Much less expensive then a proprietary or Linux-based PBX
- Scalable to any number of extensions or lines centrale telefoniczne – without the need for expensive system modules
- Adds and Moves of extensions are much easier – no need for patching network points
- Web-based configuration and status monitor
- Receive voice mails by email (Unified Messaging)
- Vendor independent – use popular Voip phones from different vendors
Read more about this partnership here.
Monday, October 15, 2007
3CX IP PBX for Windows is now available to Danish resellers via Inter-Data A/S
Silkeborg, DK October 12, 2007 – 3CX today announced that a distribution agreement between 3CX and Inter-Data A/S has been signed for the Danish market.
“This enables us to bring new and innovative products to the channel. 3CX offers our resellers an excellent opportunity to move into the VoIP market – a market with rich business opportunities, not only on the hardware, but especially on software and service offerings” said Rene Rasmussen, CEO Inter-Data A/S.
Chris Martin, Sales Director 3CX, added, “Inter-Data are well poised to provide Danish resellers with a complete end-to-end solution by adding 3CX Phone System to their current server product range and VOIP products, and backed up by the Inter-Data A/S Business Team.”
Just last month, 3CX Phone System for Windows received a “Best of Show” Award at Technology Marketing Corporation (TMC®)’s INTERNET TELEPHONY Conference and EXPO West 2007, in the United States telefonközpont.
Mr. Rasmussen confirmed, “Our ID Business team has tested several different soft VOIP PBX’s, and has without doubt found 3CX Phone System the easiest to work with, both in terms of initial installation, configuration and management – We are confident that our channel partners will benefit from the innovative 3CX IP PBX for Windows.”
About 3CX
3CX is an international developer of telecommunications software, headquartered in Europe with offices in Cyprus, USA, UK and Hong Kong. It is a Microsoft Gold Certified partner and is backed by an experienced management and development team. Its product, 3CX Phone System for Windows, has earned Windows Server 2003 Certification and has received numerous awards, including the TMC Labs 2007 Innovation Award, The Windowsnetworking.com Gold Award, as well as, the IT EXPO Best of Show award 2007, all in recognition to the company’s commitment to innovation and quality. 3CX maintains a global presence with offices in four countries and localized information available in Dutch (http://www.3cx.nl/) German (www.3cx.de), Spanish (www.3cx.es), French (www.3cx.fr), Italian (www.3cx.it), Portuguese (www.3cx.com.br), Japanese (www.3cx.jp), Simplified Chinese (www.3cx.cn) and many other languages.
3CX has a VOIP and SIP FAQ related to SIP trunking, SIP servers, VOIP and SIP phones, VOIP Gateways, and it is present in several languages, such as VOIP in Finnish, a VOIP and SIP FAQ in Dutch, in Hungarian and in Romanian.
About Inter-Data A/S
Inter-Data A/S were founded in 1993, and are specialized in PC manufacturing and value-added distribution. Inter-Data A/S employ 60 highly motivated employees at both the head office in Silkeborg and branch office in Copenhagen. Inter-Data A/S Business department focusing on channel development on innovative products like 3CX, Supermicro, Thin Clients ect.
Inter-Data A/S is distributing a range of leading brands, like Supermicro, Samsung, Synology, Xerox, MSI, iGEL, Kingston, Microsoft, 3CX and many more.
Wednesday, October 3, 2007
RingCentral VOIP
Tuesday, September 25, 2007
3CX receives award of “Best of Show” at INTERNET TELEPHONY® Conference & EXPO East 2007
About 3CX Phone System for Windows
3CX Phone System is an award-winning software-based office phone system that replaces traditional proprietary hardware PBX. It has been developed specifically for Microsoft Windows and the SMB market – making it easy to install and manage. Being based on the open SIP standard, the 3CX Phone system works with any SIP-based VOIP provider, VOIP gateway or phone. The product integrates easily with most business networks because it runs on Windows - no Linux experience is required.
For additional information on 3CX please visit www.3cx.com.
“We are delighted that our company and our new IP PBX for Windows software, the 3CX Phone system, have been singled out among the many participants at INTERNET TELEPHONY® Conference & EXPO. This award is testimony of our commitment to offering an innovative and quality product with multiple benefits for the SMB market.” said Nick Galea, CEO 3CX.
“3CX and their innovative product IP PBX for Windows, 3CX Phone System, are a standout indication of why so many enterprise buyers, developers, resellers and service providers flock to INTERNET TELEPHONY® Conference & EXPO,” said TMC President and Conference Chairman, Rich Tehrani. “Their innovation telefony voip and commitment to quality attracted many serious prospects to their booth. Attendees knew they'd find solutions in the 3CX booth voip that would help them in their businesses today.”
The Best of Show awards are presented to companies unveiling the most impressive new products or new releases at the show. Each winner displayed and demonstrated their product on the INTERNET TELEPHONY Expo show floor.
3CX maintains a VOIP and SIP FAQ in several languages, including: a VOIP FAQ in Greek, in Japanese language, a SIP FAQ in Korean, in Chinese, Hong Kong, etc.You can read the whole article here.
Monday, September 24, 2007
Ensuring the quality of VOIP on the internet
VoIP comes in lots of flavors, but the kind that delivers all your calls over your broadband Internet connection has the worst reputation these days. Providers collapse without warning, and there's no way to guarantee call quality. Still, such services have significant attractions for small businesses, including cost and features. If you decide to go this route, you don't have to accept all the bad along with the good. You can do a lot to help yourself, and you can ask your provider to help you help yourself. Here are some things you can do.
1. Make sure you have the bandwidth you need. One of your first self-help steps should be to make sure that you have the right amount of bandwidth. As the most successful small-business VoIP provider, with some 8,000 customers, Packet8 service provider 8x8 Inc. provides a reasonable basis for comparison. Its bandwidth rule of thumb is that 25 to 30 percent of the workers at a typical company are on the phone at any one time. Give yourself a cushion and assume it'll be 40 percent. 8x8 uses D.729 compression technology to squeeze a voice call into 25 Kbps of bandwidth. That means for a 10-employee business, you'll need 100 Kbps to carry calls alone, on top of all your other data needs. If your provider uses different technology, find out what it is and adjust your estimates accordingly.
2. Make sure you have the right kind of bandwidth. The "A" in "ADSL" stands for "asynchronous." That means that the speeds are different in different directions. That may be OK for home users who download more files than they upload. But if you do more back-and-forth business than Web surfing on your office network, it might sometimes be harder for people to hear you than for you to hear them. 8x8. recommends at least SDSL (synchronous DSL) and perhaps fractional T1 connections.
You can get here a good FAQ on SIP and VOIP.
To read more about the subject, click here.