selected>g711a</option>
                    <option value="g711u">g711u</option>
                </select>
                </span>
            <span class="span-row">
                    封装格式
                    <select id="talkPacketType">
                        <option value="rtp" selected>rtp</option>
                    </select>
                </span>
            <span class="span-row">
                    rtpSsrc
                    <input style="width: 80px" type="text" value="0