Intra-office communications were complex and costly for Norbert Dentressangle operations in Italy. Routing internal calls (among main and branch offices) through Telecom Italia was tallying up exces- sive monthly PSTN charges for the supply-chain management firm. With so many facilities in the territo- ry, maintaining redundant voice and data infrastructures was a burden that overloaded the IT staff. On the plus side, business was growing. On the

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