I don't know "arena" but according to this post it seems like it is possible to integrate the callable library with arena. Maybe you can get in contact with the author of the quoted post.
There also is this paper that could be helpful
@article{Vamanan:2004:ICS:971894.971898,
author = {Vamanan, Mayur and Wang, Qian and Batta, Rajan and Szczerba, Robert J.},
title = {Integration of COTS software products ARENA \& CPLEX for an inventory/logistics problem},
journal = {Comput. Oper. Res.},
issue_date = {April 2004},
volume = {,
number = {4},
month = apr,
year = {2004},
issn = {0305-0548},
pages = {533--547},
numpages = {15},
url = {http://dx.doi.org/10.1016/S0305-0548(03)00010-8},
doi = {10.1016/S0305-0548(03)00010-8},
acmid = {971898},
publisher = {Elsevier Science Ltd.},
address = {Oxford, UK, UK{31}31},
keywords = {simulation and optimization, software integration, supply chain applications},
}
#CPLEXOptimizers#DecisionOptimization