Aside from these cases, most businesses should consider using an off-site or "hosted" PBX. It is an option on many small business VoIP systems and offered by many ITSPs. The big benefit with a hosted PBX is it can offer more advanced phone system functions, such as auto-attendants and IVRs, without the expense of purchasing and managing an on-site hardware PBX.
The Session Initiation Protocol (SIP) is one of the underlying technologies that make VoIP possible. This is a text-based protocol similar to HTML. It's the most commonly used standard for setting up and controlling phone calls in most VoIP systems. You'll run across references to SIP in almost anything you do with these kinds of phone systems, especially when you're selecting any handset hardware you want to use.

For more general advice on voicemail messages, read our tips and examples for business voicemail greetings.
When you first launch a business, it’s possible to manage contacts with your personal phone number. But doing so is neither scalable nor professional. As your team and your business expand, the need for a business phone number becomes more obvious. That’s where a virtual phone number comes in handy. Instead of paying expensive bills for both your employees’ phones, your office phone, and your personal number, you can just opt for a virtual business number. For a reasonable monthly fee, virtual phones route calls to your cell phone, your home number or a VoIP phone number. So you can take business calls anytime, anywhere. Grasshopper is the perfect solution for solopreneurs and teams no bigger than 15 people. It has the best 800 number service for small businesses, letting you choose from 800, 888, 877, 844, 866, or 833 numbers. Available on any mobile device, it gives you the ability to tend to your clients wherever your business takes you. Read Review Special offer: Save $75 on annual plans or $15 on monthly plans GET STARTED RingCentral is another robust solution that brings more than just a virtual phone number to the table. It is a cloud-based PBX that provides state-of-the-art features like video voicemail, video conferencing, and screen sharing. These features allow you to communicate with your customers in a unique and personal way, and help you bring remote teams together. Read Review CallHippo offers virtual local phone numbers from more than 50 countries. It lets you add multiple users and make calls to receivers all around the world. Its features include call recording and forwarding, workflow automation, and detailed call analytics. CallHippo's pricing plans start at $14/user/month, and its service is best suited for small businesses and outbound calling teams. Read Review Sonetel is one of Sweden’s fastest-growing tech companies, and its virtual phone number solution is efficient, easy to implement, and very affordable. You can get a virtual phone number for free, with global call forwarding, voice responses, call queues, and much more. Apart from providing phone numbers, Sonetel lets you implement live-chat support features on your website or your business’s Facebook page. Read Review ⦿Free phone number if you use widget ⦿Offers live-chat and team-communication features ⦿Free call taking via mobile app Line2 is an excellent all-in-one solution for small teams. Its long list of features includes everything from call answering with a pre-recorded auto-attendant message to merged calling and voicemail transcriptions. The provider also makes it easy to pick the ideal virtual phone number by giving you toll-free and vanity options while ensuring all your calls are routed to the right place. Read Review ⦿Excellent call-management features ⦿Unlimited SMS and MMS messaging ⦿Toll-free and vanity numbers eVoice is another US virtual phone number provider that tailors to businesses of all sizes by providing advanced tools for proper communication without requiring users to set up additional equipment. It offers local, national, and international numbers and enables you to forward calls you can’t take to other employees. In addition to video conferencing and screen sharing features, a 24/7 virtual receptionist is on hand to ensure you never miss another call. Read Review Freshdesk Contact Center (formerly known as Freshcaller) is among the best toll free number providers out there. You can choose one of the available numbers or even create a customized vanity phone number. This system has the most robust call-center features for handling calls and monitoring employees’ work and productivity. Since it is available only on softphones, you won’t have to invest in any additional equipment. Freshdesk also boasts a free version with a few standard features. Read Review ⦿Freshworks integrations ⦿Powerful call-center solutions ⦿Free plan with limited features As one of the industry's leaders, VirtualPBX strikes a good balance between affordability and functionality. Thanks to its wide range of features such as unlimited minutes, auto-attendant, and customized greetings, this cloud-based VoIP solution can help a company of any size streamline and enhance its internal and external business communication. Try VirtualPBX risk-free with a 15-day money-back guarantee. Read Review As an all-in-one virtual receptionist system, MightyCall aggregates customer queries coming from phone calls, social media channels, and emails into one queue. It processes calls made and received via vanity, local, and toll-free numbers and lets its users organize client data in a highly efficient way. We recommend this provider's virtual phone services to small and mid-sized business owners on the hunt for an affordable way to improve their internal and external communication. Read Review ⦿Team collaboration features ⦿Visual voicemail and voicemail transcription ⦿Scalable solution The Nextiva service tops other providers since it delivers a CRM system for the price of a virtual phone service. Call quality, system reliability and its array of features are all top of the line. The company also provides non-stop exceptional customer care across different communication channels. This provider is great for scaling - as your number of users goes up, your monthly user fee will go down. Read Review ⦿Very reliable with 99.9% uptime ⦿More than 40 call-management features ⦿Sales and service CRM features Talkroute combines recently developed software-based features and traditional phone services aiming to turn your smartphone into a well-rounded business communication system. Featuring desktop and mobile applications, IVR, call transfer, menu prompts, and advanced reporting, Talkroute's solution is best suited for businesses looking for a cost-effective way to handle large call volumes. Read Review 8x8 offers an advanced set of call-handling features that satisfy the needs of small business owners wanting to set up a call center. In addition to a heap of features for communication with customers, this service also has plenty of options for team communication. The 8x8 system operates on any internet-connected device, as well as your existing traditional phones. Read Review ⦿International calling within 47 countries ⦿Desk phones for sale ⦿Conference calling