push a message to a cisco ip phone with CiscoTerminal.sendData(...);

hi,
i have a problem with sending data to a cisco ip phone 7960. i try this:

...
Address [] addresses = provider.getAddresses ();
Terminal [] terminals = addresses[i].getTerminals ();
CiscoTerminal ct = (CiscoTerminal)terminals[0];
String data = "<CiscoIPPhoneExecute><ExecuteItem
Url=\"http://webserver/ciscoipservices/test/test.asp\" />"+
 "</CiscoIPPhoneExecute>");

then i first try to send data as a string. but i realize that this method
is no deprecated. so i put the string into a byte array

ct.sendData(data.getBytes());
....

when i run this code. i always get an Exception. i thin a ImplException or
something like this.
can anyone help? or is there an other possibility to send a message to a
ip phone.

thanks
stefan scheuber

p.s.: software: callmanager 4.0, jdk 1.4.1, jtapi 1.4

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