  Profiting from previous works done with the \emph{INDRA} multidetector on the
description of the light response $\mathcal L$ of the CsI(\emph{Tl}) crystals
to different impinging nuclei, we propose an improved $\Delta E - \mathcal L$
identification-calibration procedure for Silicon-Cesium Iodide (Si-CsI)
telescopes, namely an Advanced Mass Estimate (\emph{AME}) method. \emph{AME} is
compared to the usual, %$"\Delta E - E"$ simple visual analysis of the
corresponding two-dimensional map of $\Delta E - E$ type, by using \emph{INDRA}
experimental data from nuclear reactions induced by heavy ions in the Fermi
energy regime. We show that the capability of such telescopes to identify both
the atomic $Z$ and the mass $A$ numbers of light and heavy reaction products,
can be quantitatively improved thanks to the proposed approach. This conclusion
opens new possibilities to use \emph{INDRA} for studying these reactions
especially with radioactive beams. Indeed, the determination of the mass for
charged reaction products becomes of paramount importance to shed light on the
role of the isospin degree of freedom in the nuclear equation of state.
