[Serusers] Append a header field with dynamic data

[Michael Stier]

Hi,

I want to append a new header field on a 183 - session progress response 
with dynamic data:

P-hint: dynamic data

The string "dynamic data" e. g. could be generated by an external 
script. Is there any way to reach this inside ser.cfg?

My imagination would be something like this:

if (status=~"183") {
  exec_msg('TEMPSTRING=`cat /tmp/string.txt`');
  append_hf("P-hint: $TEMPSTRING");
};

Many greetings
Michael