How the MSC ADAMS-Simulink interface works in every time step?

Does anyone know how the MSC ADAMS-Simulink interface works in every time step? Which integrator does the ADAMS use during this interface?

I mean when Simulink calls ADAMS, which one of the ADAMS solver (INTEGRATOR) is used to solve the EOMs?

For example, when we want to run a model in ADAMS we use the following commands within the acf file:

INTEGRATOR/GSTIFF, ERROR = 0.1, HMAX = 1.250000E-02, INTERPOLATE = ON

SIMULATE/DYNAMICS, END = 1.250000E-02, DTOUT = 1.250000E-02

but during co-simulation with Simulink these options are ignored by SIMULINK.

So, I am very interested to know what happens between them.

Suppose Simulink uses ode45, but what about ADAMS?

My question stems from the fact that in the ADAMS-Simulink interface we cant select any solver for ADAMS.