VÝZKUM author: Miroslav Voznak, CESNET Prague, voznak at cesnet dot cz

Abstract

We will describe the most considerable VoIP implementations at Czech universities. In Czech EDU, IP telephony appears with the following features:

•  used only in combination with legacy PBX, i.e. no pure solution of IP telephony being used currently,
•  Czech universities are involved in the CESNET project of IP telephony and can call each other free of charge (more than 40 VoIP gateways are registered in the CESNET project which started up in 1999),
•  IP telephony can be easily implemented as an option for existing PBX and with proprietary protocols (e.g. Siemens, Avaya, Alcatel, …)
•  the legacy PBX without possibility of IPtelephony is mostly combined with Cisco Call Manager,
•  only four universities offer IP telephony based on open-source solutions (based on Asterisk and OpenSER).