If a corporation does not have offices in other countries but makes a lot of calls to specific countries or regions, that corporation should look at getting service from an Internet Telephony Service Provider (ITSP). ITSPs today typically offer SIP based VoIP and have partnerships with many service providers to terminate calls to the PSTN in various regions or countries. Using an ITSP can significantly reduce the overall phone bill for the corporation.
Dig Deeper on VoIP Migration and Implementation
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