I heard that on a dispatch call and started investigating.
ORS § 811.507¹ makes the following rule:
(k) Is using a function of the mobile communication device that allows for only one-way voice communication while the person is:
(A) Operating a motor vehicle in the scope of the persons employment;
(B) Providing transit services; or
(C) Participating in public safety or emergency service activities.
That does say ONE WAY-NOT TWO WAY communication.
It appears the bus driver may be correct.