code: public String listSipSessionIds() {
          StringBuffer sb=new StringBuffer();
          Iterator<MobicentsSipSession> sipSessions = sipManagerDelegate.getAllSipSessions();
          while (sipSessions.hasNext()) {
              sb.append(sipSessions.next().getKey()).append(" ");
          }
          return sb.toString();
      }
docs: For debugging: return a list of all session ids currently active