Abstract
The advent of mobile telephony and Voice over IP (VoIP) has significantly impacted the traditional telephone exchange industry—to such an extent that private branch exchanges are likely to disappear completely in the near future. For large organisations, such as CERN, it is important to be able to smooth this transition by implementing new multimedia platforms that can protect past investments and the flexibility needed to securely interconnect emerging VoIP solutions and forthcoming developments such as Voice over LTE (VoLTE). We present the results of ongoing studies and tests at CERN of the latest technologies in this area.
Highlights
CERN’s current fixed telephony infrastructure, designed and implemented more than 20 years ago, is unsuccessfully struggling to adapt to modern communication needs, notably the support of multimedia capabilities and subscriber mobility. The reason for this is that it was designed as a Time Division Multiplexing (TDM) network, a technology that has its origins with the beginning of telephony
Key technology developments of the past 20 years, notably voice over IP (VoIP) and the signaling protocol SIP (Session Initiation Protocol) cannot be adopted or at all and our infrastructure has reached a dead-end in its evolution
This paper sets out our plan for revitalising the telephony infrastructure at CERN through the adoption of 21st century technologies to replace those of the 19th century
Summary
CERN’s current fixed telephony infrastructure, designed and implemented more than 20 years ago, is unsuccessfully struggling to adapt to modern communication needs, notably the support of multimedia capabilities and subscriber mobility The reason for this is that it was designed as a Time Division Multiplexing (TDM) network, a technology that has its origins with the beginning of telephony. The TDM core handles switching and call routing functions; developments by the manufacturer over the last decade have enabled us to add IP links between the PABX nodes and support for IP phones It is a robust and stable solution, the architecture has not kept pace with communication system developments and the monolithic rather than distributed architecture presents a challenge for integrating emerging technologies such as VoLTE, VoIP or WebRTC. The rest of the population consists of a mixture of emergency and lift phones with faxes, modems and virtual numbers not linked to a physical device for special use
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