使用SIP Servlet为Java EE添加语音功能 - 编程入门网
作者 佚名技术
来源 NET编程
浏览
发布时间 2012-06-16
| .getRequest(); String alreadySent = (String) origReq.getAttribute("SENT_INVITE"); if( alreadySent == null && resp.getContentLength() > 0 && resp.getContentType ().equalsIgnoreCase("application/sdp")) { String responseFrom = (String) origReq.getAttribute("CALL"); Check if this an response to INITIAL INVITE sent from the HTTP Servlet, and if there is an SDP sent in the response, create an INVITE to the other user if("INITIAL".equals(responseFrom)) { //Take the SDP and send to A Note that To address in the orginal request is the From address here and vice versa. This is what makes this servlet act like a B2BUA. SipServletRequest newReq = sf.createRequest(sas,"INVITE",origReq.getTo(),origReq.getFrom()); newReq.setContent(resp.getContent(),resp.getContentType()); SipSession ssA = newReq.getSession(true); SipSession ssB = resp.getSession(true); Set the SipSession object as a session attribute to each call leg ssA.setAttribute("OTHER_SESSION",ssB); ssB.setAttribute("OTHER_SESSION",ssA); //Test Set the b2b servlet as the handler for the response for the new request being sent. ssA.setHandler("b2b"); ssB.setHandler("b2b"); origReq.setAttribute("SENT_INVITE","SENT_INVITE"); send the request to the other user newReq.send(); //Send to A } else { If this is a response from User A then get the SDP from User A and set it i SipSession ssB = (SipSession) resp.getSession().getAttribute("OTHER_SESSION"); ssB.setAttribute("SDP",resp.getContent()); } } else { return; } // Count so that both sides sent 200. If response has a 200OK as the status code if( resp.getStatus() == 200 ) { Check if this is a response from the UserB ( first user) SipServletResponse first = (SipServletResponse) sas.getAttribute("GOT_FIRST_200"); if( first == null ) { // This is the first 200 sas.setAttribute("GOT_FIRST_200",resp); } else { //This is the second 200 sen both ACK This is a second response and now we send an ACK to both User A and UserB. This exchanges the SDP and sets up the call. sendAck(resp); sendAck(first); } } } This method sends the ACK with the SDP. private void sendAck( SipServletResponse resp ) throws IOException { SipServletReque |
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