Whether you need phones for opening a new office, supporting employees working from home, or it’s time to update your business phone system, we have done all of the research and tested over 25 small business phone systems to prepare the list of our best Top 5 most recommended business telephone systems. The manufacturer must be reliable, with a proven history and warranty support. Be the most affordable for a small business to purchase and maintain. Be future proof — compatible with standard analog landline telephone service or VoIP cloud phone service. Provides feature to transfer calls to a cell phone, a smartphone app, and supports mobile and home office employees. Must have the essentials: automated attendant call tree menus, voicemail to email, intercom, call forward, transfer, and music on hold.
You can be certain that you’ve answered the return calls from your customers by having a fixed schedule every day that’s dedicated to checking your own record of return calls. If you can have a team for this purpose, then have one. The prompt feedback you can give those prospective clients after they’ve returned your call may successfully translate to better sales and higher profitability.

Great List. Telecom Recycle is also a very good option if someone is looking to sell his/her business phones.
The nicest thing about Dialpad is it works on all of your existing devices, making it easy for companies to integrate the solution.