What is the difference between PABX and IP Telephony ?

PABX and PBX are used interchangeably as they basically point to the same system. Basically an IP PBX is the next generation of a PABX. A PABX is typically referred to as an analogue phone system, with physical phone lines or ISDN lines connected to onsite hardware.

PABX is a private branch exchange switch in a telephony environment while IP Telephony is a voice over internet protocol.

LE systeme telephonie pabx est un commutateur telephonie privé c'est a dire un boitier installé en interne qui permet de relierles lignes internes avec le reseau telephonique publiques il s"agit d'un terminal.

PBXIP ou encore (ipbx de l'anglais internet protocol private branche exchange) un autocommutateur telephonie privé utilisant le protocole Internet (IP) pour gerer les appels telephoniques d'une entreprise,en interne sur son reseau local(LAN).

PABX is a telephone switch in a telephony environment while IP Telephony is a type of telephone system that uses Internet Protocols (IP)