I have a client that had a Vodavi system. A we installed a Avaya IPO500. This client likes to have his phone speaker volume loud, and with that is my problem. At top volume of the 9508 series phone the call is distorted, where with the old Vodavi system phones were louder when using the speaker. I have place the phones side by side with both systems working and heard the difference. I have looked at new NEC and Panasonic systems and noticed same issue. Is there a new system out there that has a loud desk phone speaker that won't distort the call?