Hello Heidi,
welcome to the Polycom Community.
The community's VoIP FAQ contains this post here:
Sep 26, 2013 Question: How can I disable the call waiting tone or change the tone?
Resolution: Please check => here <=
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Best Regards
Steffen Baier
Polycom Global Services
