Generally no, not if employees are able to communicate by using pen and notepad and it is effective. However, in situations where the exchange of information is over a long duration or the information being exchanged is complex it may be necessary for the business to provide a qualified interpreter. A business should discuss with the person with the disability to determine which auxiliary aid or service will result in effective communication.
For additional information, take a look at the following resources:
Fact Sheet: Effective Communication