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What is one benefit of placing VoIP gateways in geographically separated branch offices that have an existing WAN connection?- Data can be transported between VoIP gateways over the PSTN instead of via the expensive WAN.- VoIP gateways can aggregate multiple VoIP calls for more efficient transmission to the home office.- Long-distance PSTN charges can be reduced by switching VoIP calls to the PSTN in locations where only local call charges would be incurred.- Less costly VoIP gateways can be used in place of expensive routers and modems to provide WAN connectivity.

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