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The Voice over IP solution is not only limited to corporate LAN infrastructure but has also extended to the World Wide Web This expansion is facilitated by VoIP carriers or SIP (Session Initiation Protocol) Trunk service providers, which allow corporate VoIP environments to communicate over the Internet and connect to Public Switching Telephony Network (PSTN). Businesses are replacing on-premise TOM setups with VoIP services to get maximum return on their investment. This whitepaper highlights the SIP trunking solution in general compared to a TOM-based solution and its deployment considerations in an Office Communication Server 2007 R2 environment.
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