Touchtones to answer or decline incoming call randomly not recognized by RC

I am having a problem answering calls forwarded to my mobile phones. RC is not recognizing the touchtones - press 1 to accept, 2 to decline. It is not happening all the time, but most of the time. It doesn't seem to be happening to others in my company, but I receive the vast majority of calls. I even purchased a brand new mobile phone just in case the problem was with my previous phone.