In this paper, we analyse a three-server queueing model which is equipped with a main server and two regular servers. The main server offers consultations to the identical regular servers with a preemptive priority over customers. The service of the customers at the main server undergo interruptions during consultations. An upper bound is set for the number of interruptions during the service of a customer at the main server. We consider independent Poisson arrival processes to the main server and to the regular servers. There is a finite buffer at the main server. An arriving customer to the main server will be lost when the buffer is full. The inter occurrence time for requirement for consultation follows exponential distribution having parameter, depending upon the number of busy regular servers. When both regular severs are queued at the main server for consultation, no such fresh event can occur. The service times at the main server and the regular servers are assumed to follow mutually independent phase type distributions. We establish the stability condition and the explicit formula for mean number of interruptions to a customer at the main server. Some performance measures are studied numerically.
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