Disable mute chime during conference calls for Sennheiser DW Pro 1 headset

I basically have the same question as this post:
http://social.technet.microsoft.com/Forums/en-US/ocsclients/thread/b60c40ce-6ec5-4975-ad9a-d6bf1030514b/

However, in my circumstance it's for a Sennheiser DW Pro 1 headset. There is a mute tone that is played every 5 seconds while you are muted in a conference call. I want to disable this tone. I checked Sennheiser FAQ/Documentation, Went through the Lync sound scheme trying to find the matching tone, and even installed Sennheiser's "headsetup" software but there's no option to turn this off.

Any suggestions?

Thanks!