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Besides lower costs in contrast to Public Switched Telephone Network (PSTN), Voice over Internet Protocol (VoIP) services provide better roaming, a possibility to quicker office relocation and total independence from local telephone companies (meaning that in theory you can buy VoIP services from any service provider on the globe). With VoIP services you can build a PBX which serves the same voice services to all employees around the globe thus making it possible to build virtual offices. You can also easily integrate voice, e-mail and presence services with VoIP technologies.
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