code: protected void processSipContextParameters(JBossConvergedSipMetaData metaData) {
          if (metaData.getSipContextParams() != null) {
              for (ParamValueMetaData param : metaData.getSipContextParams()) {
                  deploymentUnit.addToAttachmentList(ServletContextAttribute.ATTACHMENT_KEY,
                          new ServletContextAttribute(param.getParamName(), param.getParamValue()));
              }
          }
      }
docs: Process the context parameters defined in sip.xml. Let a user application override the sharedMetaData values.