code: public String getHeader(String name) {
  		if(name == null) {
  			throw new NullPointerException("header name is null");
  		}
  		try {
  			return RFC2396UrlDecoder.decode(((javax.sip.address.SipURI) super.uri).getHeader(name));
  		} catch (NullPointerException e) {
  			return null;
  		}
  	}
docs: /*
  (non-Javadoc)
  @see javax.servlet.sip.SipURI#getHeader(java.lang.String)