Business Telephone Sale sells Comdial Phones and accessories at the lowest prices. There are many Comdial phones, but each must work on the appropriate phone system. Comdial has manufactured multiple phone systems throughout the years, and there are major compatibility issues. As the consumer, you must purchase the Comdial telephone that will work on your existing Comdial phone system. For help with getting the right phone call us at 800-396-9699.