Topic Last Modified: 2012-10-20

Lync Server 2013 can interconnect an IP-PBX to a public switched telephone network (PSTN) gateway so that calls from a PBX phone can be routed to the PSTN, and incoming PSTN calls can be routed to a private branch exchange (PBX) phone. Similarly, Lync Server 2013 can interconnect two or more IP-PBX systems so that calls can be placed and received between PBX phones from the different IP-PBX systems.

This intertrunk routing feature can be configured by using the Lync Server Management Shell cmdlet, Set-CsTrunkConfiguration, with the new parameter, PstnUsages. This parameter specifies the set of PSTN usage records to use. A trunk uses this PSTN usage to determine a route and to route all incoming calls accordingly.

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Set-CsTrunkConfiguration -Identity <TrunkId> -PstnUsages @{add="<UsageString>"}

The following diagram illustrates Lync Server 2013 providing interconnectivity between a PSTN gateway and an IP-PBX.

Intertrunk routing between gateway and IP PBX

Lync Server connecting PSTN gateway/IP-PBX diagram

The following diagram illustrates Lync Server 2013 interconnecting two IP-PBX systems.

Intertrunk routing between two IP PBXs

Lync Server interconnecting IP-PAX systems diagram