Freshdesk Conctact Center (formerly known as Freshcaller) virtual number service fits the needs of both entrepreneurs looking for a simple and affordable service, and small businesses needing a call center. The call recording and call monitoring features make it a good choice for sales businesses too. No matter where your clients are, Freshdesk Contact Center lets you connect and provide great customer service. Select a local, toll-free or an international phone number and start making calls. You can even create a customized vanity number that people will remember.
For locations where a desk phone is required but no Ethernet cable is nearby, Yealink offers an option to use it’s reliable and secure DECT wireless extender or you can use your Wi-Fi if you prefer for quick and easy desk phone placement in places where no Ethernet cable is easily accessible — an ideal solution for installations that simply cannot run new Cat6 cabling everywhere.

Google Voice is most likely the simplest to use of all virtual phone number providers. Home, mobile, and work phones can be added in a matter of minutes. Once the phones are linked, calls and SMS messages can be received any phone chosen by the user. Users can also use their phone or web interface to answer the messages they receive. Google Voice transcribes voicemails immediately and sends user notifications through SMS and email messages.
There are, for example, industry-specific systems for hotels, call centers, and hospitals. Though most small businesses will not be looking for specialized industry systems, they often do have special hardware requirements. Some need wireless handsets that can operate outdoors or a long distance away from a base station. Others don't use handsets, but instead require wireless headsets with long battery life. Knowing what is needed before you begin will make the selection process easier.