There’s a question going around companies today concerning the value of land-line versus cellular telephones. The consensus of opinion is stay with the land-line. Is it a double investment? Absolutely not. Cellular telephones depend on access, battery power, connectivity, current bill paid, and so on. Landlines are dependable and even necessary in a crisis situation. Look at used Avaya phones to install a new system or upgrade your existing used phone system. You don’t want to be caught with no means of contact.