Is working in a call center that belongs to a usurious bank considered permissible, knowing that the nature of the work itself is free of usurious transactions?

It is permissible to work in a call center if its operations are permissible, even if its owner deals in usury or the institution provides usurious services. This is because the default rule is the permissibility of work, and some Companions of the Prophet worked for Jews who engaged in usury.