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Nokia is providing "up and running" voice over LTE technology (VoLTE) to operators from five countries in Latin America, said Dimitri Diliani, Latin American head of the Finnish telecom supplier.
Delivering voice service over IP via an LTE network is seen as improving the quality of calls.
According to the operators' GSM association (GSMA), voice calls over LTE are recognized as the industry-agreed progression of voice services across mobile networks, deploying LTE radio access technology.
Speaking to journalists during this week's Futurecom conference in São Paulo, Diliani said those services are being actively offered by carriers in Brazil, Argentina and Colombia.
Citing contractual reasons, the executive declined, however, to name the following countries or the operator themselves.
According to the Global Mobile Suppliers Association (GSA), 146 global operators are investing in VoLTE deployments, trials or studies in 68 countries, of which 82 operators in 43 countries commercially launched VoLTE-based HD voice service, compared to 25 that had launched commercial VoLTE service by July 2015.
GSA forecasts there will be over 100 LTE operators offering VoLTE service by end 2016.
In Latin America, Movistar Argentina, Avantel Colombia and CNT Ecuador were in February in the deployment phase, according to the GSA, while TIM Brazil, (partnering with Chinese telecom supplier Huawei), and Digitel Venezuela, were doing trials or testing systems.
Sweden's Ericsson is also partnering with C&W Communications (C&W) in Panama to enable Wi-Fi calling and VoLTE.