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Microsoft® Lync® Server 2013 Unleashed Second Edition by Randy Wintle, Alex Lewis, David Ross, Tom Pacyk

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Sizing

How to correctly size an IP/PSTN gateway or SIP trunk for Lync Server 2013 voice services is a common question and, unfortunately, is going to vary greatly depending on the users in each location. Sizing for an IP/PSTN gateway depends on the user’s dialing habits as well as whether any simultaneous ringing is configured.

Microsoft offers some planning numbers that can be used to perform a rough analysis. If at all possible, retrieve reporting data from the existing PBX to determine the expected usage requirements for each site. Table 32.1 offers a suggestion on how many PSTN ports to allocate to a site depending on the usage level. For example, in a branch office with 25 users with light usage, only two PSTN ports are suggested, but it ...

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