CiscoIPPhoneResponse: Request Busy

[neon2000]

When I applied the push2phone script from the SDK, only
the chime.raw was played, the message was not displayed.

The captured CiscoIPPhoneResponse was:
===
<?xml version="1.0" encoding="iso-8859-1"?>
<CiscoIPPhoneResponse>
<ResponseItem Status="1" Data="Request Busy" URL="

http://x.x.x.x/Push2phone/push2phone.asp?action=get"/>

<ResponseItem Status="0" Data="" URL="Play:chime.raw"/>
<ResponseItem Status="0" Data="" URL=""/>
</CiscoIPPhoneResponse>
===

Both the 7970 and 7960 phone has this problem.
But it works fine on the IP Communicator.

Does anyone meet the same problem?

The version of the CallManager is 4.0.1