* (non-Javadoc)
*
* @see javax.sip.ServerTransaction#sendResponse(javax.sip.message.Response)
*/
public void sendResponse(Response response) throws SipException {
SIPResponse sipResponse = (SIPResponse) response;
SIPDialog dialog = this.dialog;
if (response == null)
throw new NullPointerException("null response");
try {
sipResponse.checkHeaders();
} catch (ParseException ex) {
throw new SipException(ex.getMessage());
}
// check for meaningful response.
if (!sipResponse.getCSeq().getMethod().equals(this.getMethod())) {
throw new SipException(
"CSeq method does not match Request method of request that created the tx.");
}
/*
* 200-class responses to SUBSCRIBE requests also MUST contain an "Expires" header. The
* period of time in the response MAY be shorter but MUST NOT be longer than specified in
* the request.
*/
if (this.getMethod().equals(Request.SUBSCRIBE) && response.getStatusCode() / 100 == 2) {
if (response.getHeader(ExpiresHeader.NAME) == null) {
throw new SipException("Expires header is mandatory in 2xx response of SUBSCRIBE");
} else {
Expires requestExpires = (Expires) this.getOriginalRequest().getExpires();
Expires responseExpires = (Expires) response.getExpires();
/*
* If no "Expires" header is present in a SUBSCRIBE request, the implied default
* is defined by the event package being used.
*/
if (requestExpires != null
&& responseExpires.getExpires() > requestExpires.getExpires()) {
throw new SipException(
"Response Expires time exceeds request Expires time : See RFC 3265 3.1.1");
}
}
}
// Check for mandatory header.
if (sipResponse.getStatusCode() == 200
&& sipResponse.getCSeq().getMethod().equals(Request.INVITE)
&& sipResponse.getHeader(ContactHeader.NAME) == null)
throw new SipException("Contact Header is mandatory for the OK to the INVITE");
if (!this.isMessagePartOfTransaction((SIPMessage) response)) {
throw new SipException("Response does not belong to this transaction.");
}
// Fix up the response if the dialog has already been established.
try {
/*
* TODO Check this. The UAS MAY send a final response to the initial request before
* having received PRACKs for all unacknowledged reliable provisional responses,
* unless the final response is 2xx and any of the unacknowledged reliable provisional
* responses contained a session description. In that case, it MUST NOT send a final
* response until those provisional responses are acknowledged.
*/
if (this.pendingReliableResponse != null
&& response.getStatusCode() / 100 == 2
&& this.pendingReliableResponse.getContentTypeHeader().getContentType()
.equalsIgnoreCase("application")
&& this.pendingReliableResponse.getContentTypeHeader().getContentSubType()
.equalsIgnoreCase("sdp")) {
throw new SipException("cannot send response -- unacked povisional");
} else {
// Sending the final response cancels the
// pending response task.
if (this.pendingReliableResponse != null && sipResponse.isFinalResponse()) {
this.provisionalResponseTask.cancel();
this.provisionalResponseTask = null;
}
}
// Dialog checks. These make sure that the response
// being sent makes sense.
if (dialog != null) {
if (sipResponse.getStatusCode() / 100 == 2
&& sipStack.isDialogCreated(sipResponse.getCSeq().getMethod())) {
if (dialog.getLocalTag() == null && sipResponse.getTo().getTag() == null) {
// Trying to send final response and user forgot to set
// to
// tag on the response -- be nice and assign the tag for
// the user.
sipResponse.getTo().setTag(Utils.getInstance().generateTag());
} else if (dialog.getLocalTag() != null && sipResponse.getToTag() == null) {
sipResponse.setToTag(dialog.getLocalTag());
} else if (dialog.getLocalTag() != null && sipResponse.getToTag() != null
&& !dialog.getLocalTag().equals(sipResponse.getToTag())) {
throw new SipException("Tag mismatch dialogTag is "
+ dialog.getLocalTag() + " responseTag is "
+ sipResponse.getToTag());
}
}
if (!sipResponse.getCallId().getCallId().equals(dialog.getCallId().getCallId())) {
throw new SipException("Dialog mismatch!");
}
}
// Backward compatibility slippery slope....
// Only set the from tag in the response when the
// incoming request has a from tag.
String fromTag = ((SIPRequest) this.getRequest()).getFrom().getTag();
if (fromTag != null && sipResponse.getFromTag() != null
&& !sipResponse.getFromTag().equals(fromTag)) {
throw new SipException("From tag of request does not match response from tag");
} else if (fromTag != null) {
sipResponse.getFrom().setTag(fromTag);
} else {
if (sipStack.isLoggingEnabled())
sipStack.logWriter.logDebug("WARNING -- Null From tag in request!!");
}