Two excellent choices:
Cisco IP Communicator (CIP C) is not compatible with macOS . It is a Windows-only application (a "softphone") that relies heavily on the Windows registry and audio subsystems. cisco ip communicator mac
If your company uses the Cisco Business Edition 6000/7000, you might use the . Two excellent choices: Cisco IP Communicator (CIP C)
You can try wine or CrossOver to run the CIPC .exe . cisco ip communicator mac