/**
* Creates a default SIPResquest message that would cancel this request. Note that tag assignment
* and removal of is left to the caller (we use whatever tags are present in the original
* request).
*
* @return A CANCEL SIPRequest constructed according to RFC3261 section 9.1
* @throws SipException
* @throws ParseException
*/
public SIPRequest createCancelRequest() throws SipException {
// see RFC3261 9.1
// A CANCEL request SHOULD NOT be sent to cancel a request other than
// INVITE
if (!this.getMethod().equals(Request.INVITE))
throw new SipException("Attempt to create CANCEL for " + this.getMethod());
/*
* The following procedures are used to construct a CANCEL request. The Request-URI,
* Call-ID, To, the numeric part of CSeq, and From header fields in the CANCEL request
* MUST be identical to those in the request being cancelled, including tags. A CANCEL
* constructed by a client MUST have only a single Via header field value matching the top
* Via value in the request being cancelled. Using the same values for these header fields
* allows the CANCEL to be matched with the request it cancels (Section 9.2 indicates how
* such matching occurs). However, the method part of the CSeq header field MUST have a
* value of CANCEL. This allows it to be identified and processed as a transaction in its
* own right (See Section 17).
*/
SIPRequest cancel = new SIPRequest();
cancel.setRequestLine((RequestLine) this.requestLine.clone());
cancel.setMethod(Request.CANCEL);
cancel.setHeader((Header) this.callIdHeader.clone());
cancel.setHeader((Header) this.toHeader.clone());
cancel.setHeader((Header) cSeqHeader.clone());
try {
cancel.getCSeq().setMethod(Request.CANCEL);
} catch (ParseException e) {
e.printStackTrace(); // should not happen
}
cancel.setHeader((Header) this.fromHeader.clone());
cancel.addFirst((Header) this.getTopmostVia().clone());
cancel.setHeader((Header) this.maxForwardsHeader.clone());
/*
* If the request being cancelled contains a Route header field, the CANCEL request MUST
* include that Route header field's values.
*/
if (this.getRouteHeaders() != null) {
cancel.setHeader((SIPHeaderList) this.getRouteHeaders().clone());
}
if (MessageFactoryImpl.getDefaultUserAgentHeader() != null) {
cancel.setHeader(MessageFactoryImpl.getDefaultUserAgentHeader());
}
return cancel;
}
/**
* Creates an ACK for non-2xx responses according to RFC3261 17.1.1.3
*
* @return A SIPRequest with an ACK method.
* @throws SipException
* @throws NullPointerException
* @throws ParseException
* @author jvb
*/
public final SIPRequest createErrorAck(To responseToHeader) throws SipException, ParseException {
/*
* The ACK request constructed by the client transaction MUST contain values for the
* Call-ID, From, and Request-URI that are equal to the values of those header fields in
* the request passed to the transport by the client transaction (call this the "original
* request"). The To header field in the ACK MUST equal the To header field in the
* response being acknowledged, and therefore will usually differ from the To header field
* in the original request by the addition of the tag parameter. The ACK MUST contain a
* single Via header field, and this MUST be equal to the top Via header field of the
* original request. The CSeq header field in the ACK MUST contain the same value for the
* sequence number as was present in the original request, but the method parameter MUST
* be equal to "ACK".
*/
SIPRequest newRequest = new SIPRequest();
newRequest.setRequestLine((RequestLine) this.requestLine.clone());
newRequest.setMethod(Request.ACK);
newRequest.setHeader((Header) this.callIdHeader.clone());
newRequest.setHeader((Header) this.maxForwardsHeader.clone()); // ISSUE
// 130
// fix
newRequest.setHeader((Header) this.fromHeader.clone());
newRequest.setHeader((Header) responseToHeader.clone());
newRequest.addFirst((Header) this.getTopmostVia().clone());
newRequest.setHeader((Header) cSeqHeader.clone());
newRequest.getCSeq().setMethod(Request.ACK);
/*
* If the INVITE request whose response is being acknowledged had Route header fields,
* those header fields MUST appear in the ACK. This is to ensure that the ACK can be
* routed properly through any downstream stateless proxies.
*/
if (this.getRouteHeaders() != null) {
newRequest.setHeader((SIPHeaderList) this.getRouteHeaders().clone());
}
if (MessageFactoryImpl.getDefaultUserAgentHeader() != null) {
newRequest.setHeader(MessageFactoryImpl.getDefaultUserAgentHeader());
}
return newRequest;
}