I’m actively researching phone services for our company, and I agree with some of the others. This is an overview more than a review, doesn’t go in-depth enuff. But, it’s a good start for me, I did find it helpful, weblinks are easily accessible. Just not as informative as I’d expected and hoped.
Solopreneurs and growing businesses turn to VirtualPBX for a good deal on dedicated business phone numbers. Small to medium-sized business owners enjoy the provider’s advanced features such as audio conferencing and ring groups, while large-scale enterprise managers use this company’s solutions to accommodate their multinational call centers.

So, for example, a softphone can combine a telephone conversation with text chat and screen sharing, which means a conversation between two employees can seamlessly add more participants, handle private text chats between those participants while the call is still going on, and extend to a collaboration session in which the group shares screens, documents, and data—no prep, no reserved lines, just button clicks. In the case of a CRM integration, the system could recognize the customer's phone number or some other identifier and automatically pull up that record for the technician or salesperson answering the call. It can even alert a manager to monitor the call if it's an especially important client.
For those with voicemail greetings that get changed about as often as a new president is elected, know that this is doing a serious disservice to the caller-recipient relationship. It signals to callers that the business is anything but an authority, most likely not very detail oriented, and has questionable overall credibility and competency. Those aren’t traits that any business wants to associate itself.