A new report by Dean Ramsay, Larry Goldman [pictured] and Justin van der Lande, Analysys Mason finds that "USD127 billion was spent worldwide on telecoms IT in 2012. This spending represented an average of 6.4% of overall telecoms revenue of more than USD2 trillion .. IT spending accounted for only 10% of opex and 39% of capex worldwide in 2012".
"Spending on OSS/BSS accounted for 50% of IT spending worldwide – USD63 billion in 2012, up by 3% year-on-year. Just over one third of IT spending in 2012 (USD48 billion) was spent by the CTO or network/product group, on SDPs and apps, and on network management systems (NMSs)".
See "IT spending by communications service providers worldwide 2012" - here.