Certain aspects of the disclosure are directed to routing communications for a plurality of switchboard interfaces, each switchboard interface corresponding to a data communications-enabled device of a respective receptionist. According to a specific example, a computing server is configured and arranged to provide data communications for a plurality of endpoint devices. A processing circuit can be communicatively coupled to the computing server and configured and arranged to receive communication event data from the computing server. For each of the plurality of disparate client entities, and in response to a subscription request from a switchboard interface for the client entity, the processing circuit can initiate a new subscription for the switchboard interface. While the subscription is active, the processing circuit can provide pseudo-event message data indicating a data metric specified in a respective set of control data for the client entity derived from programming instructions received over a message exchange protocol.