  We consider GI/Ph/n+M parallel-server systems with a renewal arrival process,
a phase-type service time distribution, n homogenous servers, and an
exponential patience time distribution with positive rate. We show that in the
Halfin-Whitt regime, the sequence of stationary distributions corresponding to
the normalized state processes is tight. As a consequence, we establish an
interchange of heavy traffic and steady state limits for GI/Ph/n+M queues.
