Modern telephone systems are generally IP-based, which brings many benefits, especially to larger organisations with operations at several sites. In the past it was quite common that an organisation could have used several manufacturers’ PBX or may have used different models of PBX from the same manufacturer. This may have been the correct choice at the time if, for example, sales, engineering, customer service and finance departments all had different priorities for their phones. The difficulty with this situation was the dreaded moment when members of staff had to answer someone else’s phone and risk cutting the caller off when they tried to transfer a call. Nowadays, most businesses would probably agree that it is easier to operate the same system across all of their sites.
It is easier if handsets can be standardised so that staff can answer each other’s extensions without any difficulty. Modern phones can also display “presence”, so as not to waste time transferring calls to a member of staff who’s away from their desk. A modern phone system can provide seamless links between all of the buildings, and make the transfer of calls much easier, especially between sites.