Examples of javax.sip.header.RequireHeader

javax.sip.header.RequireHeader
The Require header field is used by UACs to tell UASs about options that the UAC expects the UAS to support in order to process the request. Although an optional header field, the Require MUST NOT be ignored if it is present.
The Require header field contains a list of option tags. Each option tag defines a SIP extension that MUST be understood to process the request. Frequently, this is used to indicate that a specific set of extension header fields need to be understood. A UAC compliant to this specification MUST only include option tags corresponding to standards-track RFCs.
If a server does not understand the option, it must respond by returning a BAD_EXTENSION Response and list those options it does not understand in the UnsupportedHeader.
Proxy and redirect servers must ignore features that are not understood. If a particular extension requires that intermediate devices support it, the extension must be tagged in the ProxyRequireHeader as well.
For Example:
Require: 100rel @see ProxyRequireHeader @see OptionTag @author BEA Systems, NIST @version 1.2

        boolean found = false;


        if (requireList != null) {


            while (requireList.hasNext() && !found) {
                RequireHeader rh = (RequireHeader) requireList.next();
                if (rh.getOptionTag().equalsIgnoreCase("100rel")) {
                    found = true;
                }
            }
        }

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          dialog.sendAck(ackRequest);
        } 


      } else if ( response.getStatusCode() == Shootme.PRACK_CODE) {
        prackTriggerReceived = true;
        RequireHeader requireHeader = (RequireHeader) response.getHeader(RequireHeader.NAME);
        if ( requireHeader.getOptionTag().equalsIgnoreCase("100rel")) {
          Dialog dialog = tid.getDialog();
          Request prackRequest = dialog.createPrack(response);
          // create Request URI
          SipURI requestURI = addressFactory.createSipURI(toUser,
              "127.0.0.1:" + Shootme.myPort);

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       * delivery of provisional responses for that request. To do that,
       * it inserts a Require header field with the option tag 100rel into
       * the request.
       */


      RequireHeader requireHeader = headerFactory
          .createRequireHeader("100rel");
      request.addHeader(requireHeader);
      // Create the client transaction.
      inviteTid = sipProvider.getNewClientTransaction(request);

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         * delivery of provisional responses for that request. To do that,
         * it inserts a Require header field with the option tag 100rel into
         * the request.
         */


        RequireHeader requireHeader = headerFactory
            .createRequireHeader("100rel");
        request.addHeader(requireHeader);
        // Create the client transaction.
        inviteTid = sipProvider.getNewClientTransaction(request);

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        boolean found = false;


        if (requireList != null) {


            while (requireList.hasNext() && !found) {
                RequireHeader rh = (RequireHeader) requireList.next();
                if (rh.getOptionTag().equalsIgnoreCase("100rel")) {
                    found = true;
                }
            }
        }

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        boolean found = false;


        if (requireList != null) {


            while (requireList.hasNext() && !found) {
                RequireHeader rh = (RequireHeader) requireList.next();
                if (rh.getOptionTag().equalsIgnoreCase("100rel")) {
                    found = true;
                }
            }
        }

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                 * delivery of provisional responses for that request. To do that,
                 * it inserts a Require header field with the option tag 100rel into
                 * the request.
                 */


                RequireHeader requireHeader = headerFactory
                        .createRequireHeader("100rel");
                request.addHeader(requireHeader);
                // Create the client transaction.
                inviteTid = sipProvider.getNewClientTransaction(request);

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                this.inviteTid = st;
                this.inviteRequest = request;


                logger.info("sending reliable provisional response.");


                RequireHeader requireHeader = headerFactory
                        .createRequireHeader("100rel");
                okResponse.addHeader(requireHeader);
                dialog.sendReliableProvisionalResponse(okResponse);
            } catch (Exception ex) {
              ex.printStackTrace();

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        boolean found = false;


        if (requireList != null) {


            while (requireList.hasNext() && !found) {
                RequireHeader rh = (RequireHeader) requireList.next();
                if (rh.getOptionTag().equalsIgnoreCase("100rel")) {
                    found = true;
                }
            }
        }

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