About 85 percent of all phone systems are already set up for customized on hold music and messages. Ten percent require your phone vendor to make a minor change. We either install the system for you, walk you through it or coordinate with your phone vendor if necessary. Five percent of all phone systems won’t allow on hold music and messages, however a new device is just coming on the market that will allow almost every phone system, and offices without systems but several phones, to have on hold.