/** Gets host of SipURL */
public String getHost() {
char[] host_terminators={':',';','?'};
Parser par = new Parser(url);
int begin = par.indexOf('@'); // skip "sip:user@"
if (begin < 0) begin = 4; // skip "sip:"
else begin++; // skip "@"
par.setPos(begin);
int end = par.indexOf(host_terminators);