/** Sends the ack when offer/answer is in 2xx/ack */
public void ackWithAnswer(String contact, String session_descriptor) {
if (contact != null) setLocalContact(new NameAddress(contact));
Message ack = MessageFactory.create2xxAckRequest(this, session_descriptor);
ackWithAnswer(ack);
}
/** Answers at the 2xx/offer (in the ack message) */
public void ackWithAnswer(String sdp) {
local_sdp = sdp;
dialog.ackWithAnswer(contact_url, sdp);
}