Legacy Private Automatic Branch Exchange (PABX) and Internet Protocol (IP) PABX.; Telecommunication systems (ICS 33.040)

Private Automatic Branch Exchange (PABX) System for Connection to Public Switched Telephone Network (PSTN) and Internet Protocol (IP) Network (Second Revision) (17 page(s), in English)

This Technical Code specifies the technical requirements for legacy Private Automatic Branch Exchange (PABX) and Internet Protocol (IP) PABX system for connection to Public Switched Telephone Network (PSTN) and IP network respectively.