SIP Provider Trunking
The final integration method isn’t so much integration with an existing PBX as it is a way to provide voice services between the end users without one of the other methods. SIP provider trunking involves using an ITSP (Internet Telephony Service Provider) to deliver voice services across the Internet to a Lync Server organization, similar to a service provider provisioning Internet access. If integration with an existing PBX is not possible with any of the other means, or if an organization wants to move away from the legacy PBX services and provider, an ITSP can replace those services. Figure 17.11 shows how a Lync user could call a PBX user using SIP trunking and the PSTN.
Figure 17.11 SIP Trunking
In this situation, ...
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