Trunks
Trunks are just a logical representation between Lync and some form of PSTN or PBX connectivity. The end of a trunk might be a media gateway, another PBX, or an ITSP providing a SIP trunk. A Lync trunk consists of an IP/PSTN gateway name or IP, a listening port on the IP/PSTN gateway, a Mediation Server, and a listening port on the Mediation Server. Routes include a list of trunks that can be used to place a call after a route is selected.
Trunk configuration in Lync is used to apply additional logic to a call after a voice route and trunk have been selected. At this point the server knows which trunk the call will be sent to, but trunks can all have different settings. This allows Lync to accommodate many gateway vendors and PBX integrations ...
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