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The patch fixes an issue where a user is on an active call using a Bluetooth car kit or Bluetooth headset and a second incoming call is received where the user lets it ring or ignores the incoming call.

The second call will be then diverted to voicemail and the first call will remain active, but incoming audio is lost on the first call. In this situation users will no longer be able to hear the first call, but the first caller will still hear the Treo Pro user.

It should be noted that if the user answers the call and swaps between calls or rejects the call, this issue is not seen otherwise, but the patch is still recommended.

Source: phonenews.com