Design and implementation of analog telephone on IPPBX network interconnection

摘要

The use of PABX between buildings existed in State Polytechnic of Malang consists of 3 types,which are produced by the same manufacturer.However,the three types of PABX have different characteristics and specifications from one another.Therefore,its merging is done by numbering method which must use prefix to be able to contact users in other PABX.Every PABX is always provided with an interface that aims to combine with different systems,so that adjustments can be made.To overcome this problem,by software-based central installation,namely IPPBX,so that if the change(migration process)occurs,a device called the internet telephone gateway can be installed.This device with one IP address can connect more than one analogue telephone number.So far the product has 32 ports.This research uses ITG with 16 ports due to the connection characteristics of the same connector as the conventional PABX.This condition will be easily implemented and does not change the existing network system in State Polytechnic of Malang.The results of the design based on the number of connected services required a number of 32 devices ITG 16 ports plus 4 ports connection to the public services telephone network(PSTN).