A number of tcl questions

1. How to prevent the hci_pd_get_input function to treat the null character as the end of string?

The external system is a machine and cannot be changed.  I need to use the hci_pd_get_input function to get the data for ack verification purposes.

2. How to define the following set of characters in the phrase definition of a pdl?

not(or(,,)) does not work

3. I need to decode the data that goes into the engine.  But hci_pd_accept gets the data directly from the input buffer.  How can decoding be done in the pdl?

4. If the data in the input fields to a Call action contains null characters, the input fields are messed up probably because it treates the null as the end of string.  How can this problem be solved?  Encoding the nulls is not feasible because frl must be used.

Thank you very much for any response.