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With only a few IPT transceivers, PTP advanced functions are not required. Clear-Com recommends PTP-aware switches when deploying over 25 transceivers 20 PTP endpoints (Iris + IPT transceivers in total) or when the network topology involves more hops (>3) between the E-IPA and IPTs.
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These requirements however assume that Clear-Com traffic is “alone” on these switches. If the customer has other types of traffic (video, Dante, etc) and multiple trunking ports (i.e. multiple traffic types mixing into a trunk port even if they are using separate VLANs), it might require more attention. In case of doubt and if the switches are not already bought, using a network comprised of 3850 with PTP-aware function would remove the risk.
for more details see our FAQ page AoIP Solutions