[reSIProcate] Convert Parameter into a string

[Lorenzo <webmaster@xxxxxxxxxxxxx>]

Hello,
I've got headers object (like NameAddr, Via etc etc) and I view them 
with a ParseCategory pointer.
I want to get getParameterByEnum and convert the resoult into a Data.

I wrote these lines but it gives me empty Data, do you know why?

--> There is a SipMessage called "msg" with a To header with a tag 
parameter...

NameAddr nad = msg.header(h_To);
ParseCategory* pc = &nad;
resip::Data nad = 
resip::Data::from(pc->getParameterByEnum(resip::ParameterTypes::tag));
cout << std::string(nad.c_str()); // print "00000000"

Any help really appreciated!

Thank you,

LB