The products and services in this review roundup are focused on business use and because of this either provide some PBX features or serve as full-on virtual PBXes. This may mean, among other things, that they provide service to telephone sets on your employees' desks. Most also support electronic faxing in some fashion, either directly (which can be a significant challenge for some VoIP services) or by simply integrating an incoming fax with your email system. Other popular features are video conferencing and shared meeting software (so meeting attendees not only hear each other but can present presentations or documents in a shared work space).
To get a better picture of the savings of VoIP for home use, here's a real life example: Long distance calls with a VoIP provider can be as little as $10 per month, if not less. Major telecommunications corporations typically charge more for such packages, even 2 or 3 times as much. If you look at this over the course of a year, that’s no small change.  
Overall, VoIP is simply the better option for the vast majority of customers. Dropping your landline means no more hidden fees or metered long distance calling charges. Everything is charged at one low rate by most providers and your ability to customize your phone service to exactly what you need is far greater. Unless you've got some highly unique circumstances that somehow mandate a landline, VoIP is simply the better choice.

SIP-T29G IP Phone is the most advanced model in the Yealink T2 series. It has a high-resolution TFT color display, delivers a rich visual experience.Yealink Optima HD technology enables rich, clear, life-like voice communications. Supports Gigabit Ethernet, a variety of device connections, including EHS headset and USB. With programmable keys, the IP Phone supports vast productivity enhancing features.
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Voicemail routing can take multiple forms, but they're basically rules you can apply to incoming calls that will automatically route them to voicemail without even causing a ring. For example, if calls come in with Caller ID blocked, those can be routed directly to voicemail. Or if you're simply not into talking to anyone, you can hang out a digital Do Not Disturb sign and route all calls to voicemail, perhaps until you're feeling more social or every day between the hours of 9 PM and 7 AM. 
Business VoIP is the modern form of business phone service utilizing an internet connection instead of a PSTN landline connection. By sending your voice, video, and data communications through your internet network, your business can achieve a high quality VoIP phone system for a fraction of traditional legacy setups. Business VoIP solutions differ from landline services as feature rich alternatives for small to medium sized businesses.
While we think Grasshopper is great for small businesses, it misses out on our “Best Small-Business Phone Service” title because, compared to Ooma, Grasshopper is a little expensive. Grasshopper plans start at $26 per month, assuming you sign up for annual billing. And starting plans include only one business phone number with up to three extensions.
Sending faxes over VoIP networks is sometimes referred to as Fax over IP (FoIP). Transmission of fax documents was problematic in early VoIP implementations, as most voice digitization and compression codecs are optimized for the representation of the human voice and the proper timing of the modem signals cannot be guaranteed in a packet-based, connection-less network. A standards-based solution for reliably delivering fax-over-IP is the T.38 protocol.

To help businesses work from home, RingCentral provides unlimited internet faxing and audioconferencing on all the plans listed above. Video meetings can include up to 100 participants, and meetings can last up to 24 hours—just in case your group needs to burn the midnight oil. Standard plans and higher also include popular communication integrations like 365, G Suite, and Slack.


An important disadvantage of the landline is that you cannot easily scale it up or down. This is why many companies with rapidly expanding or contracting business sizes prefer VoIP because it allows enterprise management to easily add, edit or even delete user rights centrally through the control panel. It is not necessary to follow the tedious processes involved if you are using a regular landline. This makes internet phone technology significantly more suitable for large business organizations.
SIP networks usually have a proxy server and a SIP gateway. The proxy sever helps lighten the functional requirements of SIP endpoints. It also acts as both client and server, but it adds functionality around call routing and policy-based management. SIP gateways handle the routing and connectivity requirements for connecting SIP calls to other networks. Typically, the advanced features of the VoIP vendors we review here are largely based on the proprietary management technology they build into their proxy servers and gateways. By offering VoIP solutions where these elements of a SIP solution are hosted in the cloud, the providers reviewed here have more flexibility in building advanced features since they have more control over deployment and reliability.
E.164 is a global FGFnumbering standard for both the PSTN and PLMN. Most VoIP implementations support E.164 to allow calls to be routed to and from VoIP subscribers and the PSTN/PLMN.[27] VoIP implementations can also allow other identification techniques to be used. For example, Skype allows subscribers to choose "Skype names"[28] (usernames) whereas SIP implementations can use URIs[29] similar to email addresses. Often VoIP implementations employ methods of translating non-E.164 identifiers to E.164 numbers and vice versa, such as the Skype-In service provided by Skype[30] and the ENUM service in IMS and SIP.[31]
Therefore, VoIP solutions also need to handle MNP when routing a voice call. In countries without a central database, like the UK, it might be necessary to query the GSM network about which home network a mobile phone number belongs to. As the popularity of VoIP increases in the enterprise markets because of least cost routing options, it needs to provide a certain level of reliability when handling calls.
In India, it is legal to use VoIP, but it is illegal to have VoIP gateways inside India.[61] This effectively means that people who have PCs can use them to make a VoIP call to any number, but if the remote side is a normal phone, the gateway that converts the VoIP call to a POTS call is not permitted by law to be inside India. Foreign based VoIP server services are illegal to use in India.[61]
Packed with advanced phone system features necessary to operate a small to medium businesses, such as hosted PBX capabilities, desk-to-desk calling, automated attendant systems, call routing and even music-on-hold, Business phone services powered by VoIP technology make it easy for any company to operate with the same level of professionalism customers expect from large scale enterprise systems. Business VoIP systems also include overall Unified Communication solutions to empower the mobility and flexibility needed for any size businesses. With an inexpensive, feature filled phone solutions, your business can operate at a high level on par with large scale systems, without having to worry about the cost.

Communication on the IP network is perceived as less reliable in contrast to the circuit-switched public telephone network because it does not provide a network-based mechanism to ensure that data packets are not lost, and are delivered in sequential order. It is a best-effort network without fundamental Quality of Service (QoS) guarantees. Voice, and all other data, travels in packets over IP networks with fixed maximum capacity. This system may be more prone to data loss in the presence of congestion[a] than traditional circuit switched systems; a circuit switched system of insufficient capacity will refuse new connections while carrying the remainder without impairment, while the quality of real-time data such as telephone conversations on packet-switched networks degrades dramatically.[16] Therefore, VoIP implementations may face problems with latency, packet loss, and jitter.[16][17]
Like the rest of us, you probably don't like to get hassled with unwanted phone calls when you’re at home. You can also implement “enhanced call forwarding” to reroute and block the numbers that you specify, without the caller having any idea. You also can set up your phone to block international and directory assistance calls, so they don’t bother you at home. 
GoToConnect has nearly as many glowing critical reviews as the Radiohead discography, minus the pretentious lyricism. GoToConnect has established a positive industry reputation since its launch as Jive in 2006, thanks mostly to its interface simplicity, focus on small businesses, and large array of telephone features that are available to all pricing tiers.
While it doesn't offer as many features as its business-class version, residential VoIP is still overwhelmingly attractive when compared to standard phone service; firstly because of its much lower overall price tag and second because it simply offers more features than an old fashioned long line. You can keep your current number, suffer zero restrictions when it comes to 911 or long-distance calling, drop your monthly price to a low fixed number, and take advantage of VoIP-only features like smart call routing, virtual numbers, and more.
Most businesses need a portable phone system that can be used anywhere. Of course, landlines do not meet this criterion, and no landline is suitable communication during the journey. The answer is a digital VoIP service that can be used anywhere in the world. All you need is an internet connection and your VoIP phone can be connected to any phone number in the world, whether it is connected to the VoIP network or not.
What makes SIP so popular is not only that it's deep and flexible, but also because it was purpose-built to engage in multimedia (meaning not just audio but also video and even text) communications over TCP/IP networks. For VoIP calls, SIP can set up calls using a number of IP-related protocols, including the Stream Control Transmission Protocol (SCTP), the Transmission Control Protocol (TCP), and the User Datagram Protocol (UDP), among others. But it can also handle other functions, including session setup (initiating a call at the target endpoint—the phone you're calling), presence management (giving an indicator of whether a user is "available," "away," etc.), location management (target registration), call monitoring, and more. Despite all that capability, SIP is simple compared to other VoIP protocols primarily because it's text-based and built on a simple request/response model that's similar in many ways to both HTTP and SMTP. Yet, it's still capable of handling the most complex operations of business-grade PBXes.  
The service's we detail below, however, aren't triple play providers. Every service detailed here is an independent residential VoIP provider that you can use over any broadband internet connection. But while that means their pricing is probably somewhat more transparent than in a triple play scenario, some of them do still obscure the real number you'll wind up paying. This can happen in several ways.
You know Verizon; everybody knows Verizon. It’s a mobile leader, and its ultra-fast Fios (fiber-optic internet) service is expanding rapidly—so of course it’s also in the VoIP business. Verizon has built-in  bring-your-own-device (BYOD) solutions, as well as the internet connections (both fiber-optic and DSL) to support a reliable VoIP business service. Consolidation of all your business’s telecommunication needs into a single bill could be easily accomplished with Verizon. It would be more convenient than cheap, however.
IP communication provides for device mobility. For example, a residential broadband connection may be used as a link to a virtual private network of a corporate entity, in which case the IP address being used for customer communications may belong to the enterprise, not being the IP address of the residential ISP. Such off-premises extensions may appear as part of an upstream IP PBX. On mobile devices, e.g., a 3G handset or USB wireless broadband adapter, the IP address has no relationship with any physical location known to the telephony service provider, since a mobile user could be anywhere in a region with network coverage, even roaming via another cellular company.
In addition to making sure your internet service can handle your VoIP traffic, you also need to make sure your local area network (LAN) can handle it. What makes network management tricky with VoIP is that if you simply drop it onto your network, that traffic will get processed the same as any other traffic, meaning your shared accounting application or those 20 gigabytes worth of files your assistant just stored in the cloud.

That being said, Grasshopper doesn’t offer any conferencing tools. For that, you’ll have to sign up for join.me—Grasshopper’s sister company. This service offers both video and audioconferencing, but it does cost an extra $10–$30 per month. That’s another strike against Grasshopper, since most providers in Grasshopper’s price range include conferencing features.
There are two basic kinds of softphone: a "fat" phone that's coded to run only on a full-fledged PC be that a Windows, Mac, or Linux machine. This software needs a real desktop or laptop CPU and all the other accouterments associated with a full-on PC in order to perform its functions. The other kind of softphone is one designed for a mobile device. Mobile VoIP clients are "slimmer" than a desktop softphone, which really just means they're designed to look a little different and probably have a few less features since mobile devices aren't as powerful as desktop machines. But if you're looking to run your home phone off your mobile phone wherever you are, then a mobile softphone is definitely the ticket; so be sure to investigate whether you residential VoIP provider offers a dedicated mobile client, whether that client will run on your mobile device, and how much it'll add to your monthly service charge.
VoIP solutions aimed at businesses have evolved into unified communications services that treat all communications—phone calls, faxes, voice mail, e-mail, web conferences, and more—as discrete units that can all be delivered via any means and to any handset, including cellphones. Two kinds of service providers are operating in this space: one set is focused on VoIP for medium to large enterprises, while another is targeting the small-to-medium business (SMB) market.[13]
The security concerns of VoIP telephone systems are similar to those of other Internet-connected devices. This means that hackers with knowledge of VoIP vulnerabilities can perform denial-of-service attacks, harvest customer data, record conversations, and compromise voicemail messages. Compromised VoIP user account or session credentials may enable an attacker to incur substantial charges from third-party services, such as long-distance or international calling.
VoIP service providers offer many highly advanced, next generation calling, texting, video, and conferencing features. Often these features are included, and are valuable assets every step of the way throughout your specific communication needs. Traditionally, many of the calling features now included with VoIP phone services were exercised by a human being operating a switchboard. Directing call traffic appropriately is vital to the success of any business. With Voice Over IP solutions, many of them are customizable to put your business at the pinnacle of efficiency and professionalism. Network features are designed to make sure your business never misses a beat – keeping your infrastructure at the tip of your fingers at all times.
One advantage of the traditional landline services is that electrical power is sent over the telephone wires so your phone service is isolated from your house power. This meant that your phone service would continue to work if your house power went out. However, with VoIP, power is used not only for the ATA, or the IP phone, but it is also used for your Internet modem and router devices. No power also typically means no Internet service.
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