IP backbone/retrofit general purpose paging systems are a combination of analog speakers and cabling connected IP network audio gateways on existing or new network infrastructures. This type system allows use of existing analog infrastructure/speakers, and provides the advantage of migration to IP control. IP backbone system deployment is much faster than analog and offers the benefit of using software to make changes such as volume levels, zoning, etc. Access to make page announcements can be stand alone phones or microphones, as well as FXO, FXS, and SIP. IP backbone systems also provide the ability to connect IP speaker and horn endpoints that broadcast simultaneously with analog speakers. This type system is often used for larger buildings or areas of coverage and is typically 1 to 200 zones.