As a follow up to my post on Bluetooth in the RX 330 dropping calls when Call Waiting is activated.
Motorola passed the issue to Cingular, who said they will not look into it as they deem it an " accessory" issue, rather than a problem with the network or handset. Lexus Customer Service was extremely helpful but the end result is they don't have a fix and have determined that their Bluetooth Handsfree will not support Call Waiting in most phones. They have referred it for review for a possible update in the future.
The only work arounds for now are:
1. Disable call waiting on the Motorola Razr handset. The second call will go directly to Voice Mail if you are on a call.
2. Use the handset, # button, to switch between calls. Not ideal if you're driving but it works so that you don't loose both calls.