There is a Macintosh ROLM 244-PC phone "control" application:
The ROLMphone 244PC is a smart, voice and data-communications telephone
that links personal computers to the ROLM 9751 CBX and ROLM CBX II family
of voice/data controllers. It combines a digital ROLM telephone with data
communications features that support the "AT" intelligent modem command
set. The ROLMphone 244PC also includes a documented programming interface
(API) that lets programmers design specific, telephone-enhanced
applications in areas like outbound dialing, inbound answering, telephone
management, and integrated voice/data applications. The documented
ROLMphone 244PC API lets a user write customized applications.
You may wish to contact ROLM's direct sales and support team for a copy of
the API documentation and write your own control program.