int index = url.indexOf(';');
if (index < 0) return;
Parser par = new Parser(url,index);
while (par.hasMore()) {
int begin_param = par.getPos();
par.skipChar();
if (par.getWord(SipParser.param_separators).equals(name)) {
String top = url.substring(0,begin_param);
par.goToSkippingQuoted(';');
String bottom = "";
if (par.hasMore()) bottom = url.substring(par.getPos());