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<!DOCTYPE html><html lang="zh-Hans" data-theme="light"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width,initial-scale=1"><title>hpng</title><meta name="description" content="卖掉梦想，不一定换来柴米油盐！"><meta name="author" content="hpng"><meta name="copyright" content="hpng"><meta name="format-detection" content="telephone=no"><link rel="shortcut icon" href="/img/favicon.png"><link rel="canonical" href="http://nikohpng.github.io/"><meta http-equiv="Cache-Control" content="no-transform"><meta http-equiv="Cache-Control" content="no-siteapp"><link rel="preconnect" href="//cdn.jsdelivr.net"/><link rel="preconnect" href="//fonts.googleapis.com" crossorigin="crossorigin"/><link rel="preconnect" href="//busuanzi.ibruce.info"/><link rel="preconnect" href="//zz.bdstatic.com"/><meta property="og:type" content="website"><meta property="og:title" content="hpng"><meta property="og:url" content="http://nikohpng.github.io/"><meta property="og:site_name" content="hpng"><meta property="og:description" content="卖掉梦想，不一定换来柴米油盐！"><meta property="og:image" content="http://nikohpng.github.io/img/100.jpg"><meta property="article:published_time" content="2024-03-17T11:51:46.243Z"><meta property="article:modified_time" content="2024-03-17T11:51:46.243Z"><meta name="twitter:card" content="summary"><script>var activateDarkMode = function () {
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</head><body><div id="mobile-sidebar"><div id="menu_mask"></div><div id="mobile-sidebar-menus"><div class="mobile_author_icon"><img class="avatar-img" data-lazy-src="/img/100.jpg" onerror="onerror=null;src='/img/friend_404.gif'" alt="avatar"/></div><div class="mobile_post_data"><div class="mobile_data_item is-center"><div class="mobile_data_link"><a href="/archives/"><div class="headline">文章</div><div class="length_num">66</div></a></div></div><div class="mobile_data_item is-center"> <div class="mobile_data_link"><a href="/tags/"><div class="headline">标签</div><div class="length_num">51</div></a></div></div><div class="mobile_data_item is-center"> <div class="mobile_data_link"><a href="/categories/"><div class="headline">分类</div><div class="length_num">22</div></a></div></div></div><hr/><div class="menus_items"><div class="menus_item"><a class="site-page" href="/"><i class="fa-fw fas fa-home"></i><span> 首页</span></a></div><div class="menus_item"><a class="site-page" href="/tags/"><i class="fa-fw fas fa-tags"></i><span> 标签</span></a></div><div class="menus_item"><a class="site-page" href="/categories/"><i class="fa-fw fas fa-folder-open"></i><span> 分类</span></a></div><div class="menus_item"><a class="site-page" href="/categories/Memory/"><i class="fa-fw fas fa-tags"></i><span> 记忆</span></a></div><div class="menus_item"><a class="site-page" href="javascript:void(0);"><i class="fa-fw fas fa-list"></i><span> 娱乐</span><i class="fas fa-chevron-down expand"></i></a><ul class="menus_item_child"><li><a class="site-page" href="/music/"><i class="fa-fw fas fa-music"></i><span> 音乐</span></a></li><li><a class="site-page" href="/movies/"><i class="fa-fw fas fa-video"></i><span> 电影</span></a></li></ul></div></div></div></div><div id="body-wrap"><header class="full_page" id="page-header" style="background-image: url(/img/bg3.jpg)"><nav id="nav"><span class="pull-left" id="blog_name"><a class="blog_title" id="site-name" href="/">hpng</a></span><span class="pull-right menus"><div id="search_button"><a class="site-page social-icon search"><i class="fas fa-search fa-fw"></i><span> 搜索</span></a></div><div class="menus_items"><div class="menus_item"><a class="site-page" href="/"><i class="fa-fw fas fa-home"></i><span> 首页</span></a></div><div class="menus_item"><a class="site-page" href="/tags/"><i class="fa-fw fas fa-tags"></i><span> 标签</span></a></div><div class="menus_item"><a class="site-page" href="/categories/"><i class="fa-fw fas fa-folder-open"></i><span> 分类</span></a></div><div class="menus_item"><a class="site-page" href="/categories/Memory/"><i class="fa-fw fas fa-tags"></i><span> 记忆</span></a></div><div class="menus_item"><a class="site-page" href="javascript:void(0);"><i class="fa-fw fas fa-list"></i><span> 娱乐</span><i class="fas fa-chevron-down expand"></i></a><ul class="menus_item_child"><li><a class="site-page" href="/music/"><i class="fa-fw fas fa-music"></i><span> 音乐</span></a></li><li><a class="site-page" href="/movies/"><i class="fa-fw fas fa-video"></i><span> 电影</span></a></li></ul></div></div><span class="toggle-menu close"><a class="site-page"><i class="fas fa-bars fa-fw"></i></a></span></span></nav><div id="site-info"><h1 id="site_title">hpng</h1><div id="site_subtitle"><span id="subtitle"></span></div><div id="site_social_icons"><a class="social-icon" href="https://github.com/nikohpng" target="_blank" title="Github"><i class="fab fa-github"></i></a><a class="social-icon" href="mailto:[email protected]" target="_blank" title="Email"><i class="fas fa-envelope"></i></a></div></div><div id="scroll_down"><i class="fas fa-angle-down scroll-down-effects"></i></div></header><main class="layout_page" id="content-inner"><div class="recent-posts" id="recent-posts"><div class="recent-post-item"><div class="post_cover left_radius"><a href="/2024/03/17/memory/%E9%99%A4%E5%8D%B4%E5%B7%AB%E5%B1%B1%E4%B8%8D%E6%98%AF%E4%BA%91/" title="除却巫山不是云"> <img class="post_bg" data-lazy-src="/images/memory/family.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="除却巫山不是云"></a></div><div class="recent-post-info"><a class="article-title" href="/2024/03/17/memory/%E9%99%A4%E5%8D%B4%E5%B7%AB%E5%B1%B1%E4%B8%8D%E6%98%AF%E4%BA%91/" title="除却巫山不是云">除却巫山不是云</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2024-03-17T11:43:32.000Z" title="发表于 2024-03-17 19:43:32">2024-03-17</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox article-meta__icon"></i><a class="article-meta__categories" href="/categories/Memory/">Memory</a></span></div><div class="content">离思
元稹
曾经沧海难为水，除却巫山不是云。
取次花丛懒回顾，半缘修道半缘君。
</div></div></div><div class="recent-post-item"><div class="post_cover right_radius"><a href="/2024/03/14/memory/%E6%AC%B2%E5%BE%97%E5%91%A8%E9%83%8E%E9%A1%BE%E6%97%B6%E6%97%B6%E8%AF%AF%E6%8A%9A%E7%90%B4/" title="欲得周郎顾时时误抚琴"> <img class="post_bg" data-lazy-src="/images/memory/sakura.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="欲得周郎顾时时误抚琴"></a></div><div class="recent-post-info"><a class="article-title" href="/2024/03/14/memory/%E6%AC%B2%E5%BE%97%E5%91%A8%E9%83%8E%E9%A1%BE%E6%97%B6%E6%97%B6%E8%AF%AF%E6%8A%9A%E7%90%B4/" title="欲得周郎顾时时误抚琴">欲得周郎顾时时误抚琴</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2024-03-14T12:06:44.000Z" title="发表于 2024-03-14 20:06:44">2024-03-14</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox article-meta__icon"></i><a class="article-meta__categories" href="/categories/Memory/">Memory</a></span></div><div class="content">国风·郑风·子衿
诗经
鸣筝金粟柱，素手玉房前。
欲得周郎顾，时时误拂弦。
</div></div></div><div class="recent-post-item"><div class="post_cover left_radius"><a href="/2024/03/14/memory/%E7%BA%B5%E6%88%91%E4%B8%8D%E5%BE%80%E5%AD%90%E5%AE%81%E4%B8%8D%E5%97%A3%E9%9F%B3/" title="纵我不往子宁不嗣音"> <img class="post_bg" data-lazy-src="/images/memory/plum_blossom.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="纵我不往子宁不嗣音"></a></div><div class="recent-post-info"><a class="article-title" href="/2024/03/14/memory/%E7%BA%B5%E6%88%91%E4%B8%8D%E5%BE%80%E5%AD%90%E5%AE%81%E4%B8%8D%E5%97%A3%E9%9F%B3/" title="纵我不往子宁不嗣音">纵我不往子宁不嗣音</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2024-03-14T11:57:26.000Z" title="发表于 2024-03-14 19:57:26">2024-03-14</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox article-meta__icon"></i><a class="article-meta__categories" href="/categories/Memory/">Memory</a></span></div><div class="content">国风·郑风·子衿
诗经
青青子衿，悠悠我心。纵我不往，子宁不嗣音？
青青子佩，悠悠我思。纵我不往，子宁不来？
挑兮达兮，在城阙兮。一日不见，如三月兮。
</div></div></div><div class="recent-post-item"><div class="post_cover right_radius"><a href="/2024/02/25/memory/%E9%82%A3%E4%BA%BA%E5%8D%B4%E5%9C%A8%E7%81%AF%E7%81%AB%E9%98%91%E7%8F%8A%E5%A4%84/" title="那人却在灯火阑珊处"> <img class="post_bg" data-lazy-src="/images/memory/fireworks.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="那人却在灯火阑珊处"></a></div><div class="recent-post-info"><a class="article-title" href="/2024/02/25/memory/%E9%82%A3%E4%BA%BA%E5%8D%B4%E5%9C%A8%E7%81%AF%E7%81%AB%E9%98%91%E7%8F%8A%E5%A4%84/" title="那人却在灯火阑珊处">那人却在灯火阑珊处</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2024-02-25T11:10:34.000Z" title="发表于 2024-02-25 19:10:34">2024-02-25</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox article-meta__icon"></i><a class="article-meta__categories" href="/categories/Memory/">Memory</a></span></div><div class="content">青玉案 元夕
辛弃疾
东风夜放花千树，更吹落，星如雨。
宝马雕车香满路。
凤箫声动，玉壶光转，一夜鱼龙舞。
蛾儿雪柳黄金缕，笑语盈盈暗香去。
众里寻他千百度，蓦然回首，那人却在，灯火阑珊处。
</div></div></div><div class="recent-post-item"><div class="post_cover left_radius"><a href="/2024/02/24/memory/%E4%B8%BA%E4%BC%8A%E6%B6%88%E5%BE%97%E4%BA%BA%E6%86%94%E6%82%B4/" title="为伊消得人憔悴"> <img class="post_bg" data-lazy-src="/images/memory/haggard.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="为伊消得人憔悴"></a></div><div class="recent-post-info"><a class="article-title" href="/2024/02/24/memory/%E4%B8%BA%E4%BC%8A%E6%B6%88%E5%BE%97%E4%BA%BA%E6%86%94%E6%82%B4/" title="为伊消得人憔悴">为伊消得人憔悴</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2024-02-24T11:28:11.000Z" title="发表于 2024-02-24 19:28:11">2024-02-24</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox article-meta__icon"></i><a class="article-meta__categories" href="/categories/Memory/">Memory</a></span></div><div class="content">蝶恋花
柳永
伫倚危楼风细细，望极春愁，黯黯生天际。草色烟光残照里，无言谁会凭阑意。
拟把疏狂图一醉，对酒当歌，强乐还无味。衣带渐宽终不悔，为伊消得人憔悴
</div></div></div><div class="recent-post-item"><div class="post_cover right_radius"><a href="/2024/02/24/memory/%E5%BE%85%E5%88%B0%E5%B1%B1%E8%8A%B1%E7%83%82%E6%BC%AB%E6%97%B6/" title="待到山花烂漫时"> <img class="post_bg" data-lazy-src="/images/memory/bloom.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="待到山花烂漫时"></a></div><div class="recent-post-info"><a class="article-title" href="/2024/02/24/memory/%E5%BE%85%E5%88%B0%E5%B1%B1%E8%8A%B1%E7%83%82%E6%BC%AB%E6%97%B6/" title="待到山花烂漫时">待到山花烂漫时</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2024-02-24T02:48:55.000Z" title="发表于 2024-02-24 10:48:55">2024-02-24</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox article-meta__icon"></i><a class="article-meta__categories" href="/categories/Memory/">Memory</a></span></div><div class="content">卜算子.咏梅
风雨送春归，飞雪迎春到。
已是悬崖百丈冰，犹有花枝俏。
俏也不争春，只把春来报。
待到山花烂漫时，她在丛中笑。
</div></div></div><div class="recent-post-item"><div class="post_cover left_radius"><a href="/2024/01/01/freeswitch/%E9%98%85%E8%AF%BBSIP%E5%8D%8F%E8%AE%AE%E8%A7%82%E5%90%8E%E6%84%9F/" title="阅读SIP协议观后感"> <img class="post_bg" data-lazy-src="https://i.loli.net/2020/05/01/gkihqEjXxJ5UZ1C.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="阅读SIP协议观后感"></a></div><div class="recent-post-info"><a class="article-title" href="/2024/01/01/freeswitch/%E9%98%85%E8%AF%BBSIP%E5%8D%8F%E8%AE%AE%E8%A7%82%E5%90%8E%E6%84%9F/" title="阅读SIP协议观后感">阅读SIP协议观后感</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2024-01-01T03:25:57.000Z" title="发表于 2024-01-01 11:25:57">2024-01-01</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox article-meta__icon"></i><a class="article-meta__categories" href="/categories/freeswitch/">freeswitch</a></span></div><div class="content">本文主要记录阅读 SIP rfc3261 文档的一些所思所考，不会对其进行整理分类，并且存在跳跃性
生成 SIP 响应
8.2.6
除了 invite 外需要生成临时响应，其它响应应该立即响应
生成的临时响应，请求中的时间戳应该直接复制到响应中。如果响应慢就需要将延迟时间以 s 为单位，将时间生成在响应中
响应的 Call-ID、CSeq、VIA的顺序必须相同。除了 100，其它响应的 uri 内容必须相同，并且需要添加一个 tag，用于 dialog。
事务的解读事务的分为客户端事务与服务器事务，客户端事务发送请求，服务器事务发送响应。
无状态代理不包含客户端事务或服务器事务。
200(Ok)的ack作用：主要为了确保 200ok 能够正常发送到 UAC。如果后续不发送 ACK，那么服务端会不断发送，并且在三分钟后断开连接
疑问：为啥 200 ok 的 ack 作为自己单独的事务？
解答：这样设计的原因是保证送达到UAC，并且如果没有回复 ACK，那么 UAS 将会重传
客户端事务：客户端事务的主要负责将接收到的响应传递给 TU, 并过滤重传与不允许的传递。对于 invite ...</div></div></div><div class="recent-post-item"><div class="post_cover right_radius"><a href="/2023/12/24/freeswitch/Sip%E5%8D%8F%E8%AE%AE%E4%B8%AD%E7%9A%84%E4%B8%80%E4%BA%9B%E6%A6%82%E5%BF%B5/" title="Sip协议中的一些概念"> <img class="post_bg" data-lazy-src="https://i.loli.net/2020/05/01/gkihqEjXxJ5UZ1C.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Sip协议中的一些概念"></a></div><div class="recent-post-info"><a class="article-title" href="/2023/12/24/freeswitch/Sip%E5%8D%8F%E8%AE%AE%E4%B8%AD%E7%9A%84%E4%B8%80%E4%BA%9B%E6%A6%82%E5%BF%B5/" title="Sip协议中的一些概念">Sip协议中的一些概念</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2023-12-24T03:13:54.000Z" title="发表于 2023-12-24 11:13:54">2023-12-24</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox article-meta__icon"></i><a class="article-meta__categories" href="/categories/freeswitch/">freeswitch</a></span></div><div class="content">本文主要介绍 SIP 协议中的一些缩写字符的含义，这些缩写在阅读 Sofia-sip 的代码时常有出现
Sip 缩写字符
线性空白（Linear White Space，简称LWS）: 位于文本字符序列中的空白字符，包括空格、制表符和换行符等。在计算机编程中，线性空白通常用来描述文本中字符之间的间距，包括但不限于字母、数字、标点符号等。线性空白与非线性空白（Non-Linear White Space，简称NLWS）相对，非线性空白一般指符号或标点之间的间距，如句子结束的标点符号与下一句的起始字母之间的间隔
CRLF: 换行符
</div></div></div><div class="recent-post-item"><div class="post_cover left_radius"><a href="/2023/12/23/freeswitch/Sofia%E4%B8%AD%E7%9A%84%E4%B8%80%E4%BA%9B%E6%A6%82%E5%BF%B5/" title="Sofia中的一些概念"> <img class="post_bg" data-lazy-src="https://i.loli.net/2020/05/01/gkihqEjXxJ5UZ1C.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Sofia中的一些概念"></a></div><div class="recent-post-info"><a class="article-title" href="/2023/12/23/freeswitch/Sofia%E4%B8%AD%E7%9A%84%E4%B8%80%E4%BA%9B%E6%A6%82%E5%BF%B5/" title="Sofia中的一些概念">Sofia中的一些概念</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2023-12-23T13:36:32.000Z" title="发表于 2023-12-23 21:36:32">2023-12-23</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox article-meta__icon"></i><a class="article-meta__categories" href="/categories/freeswitch/">freeswitch</a></span></div><div class="content">本文主要对 Sofia 中的一些概念进行分析与解释，方便进行源码阅读。
Sofia 概念事件循环Event loop 与根对象 root object
NUA以事件反应器模式(也称为分发及通知模式)驱动事件系统(请参考[Using Design Patterns to Develop Reusable Object-oriented Communication Software, D.C. Schmidt, CACM October ‘95, 38(10): 65-74]一书)。Sofia以任务作为编程模型的基本执行单元。根据编程模型，程序可以请求事件循环在特定事件触发时调用回调函数。具体事件包括I/O激活，定时器或其它任务传递的异步消息。
root 对象是应用软件中描述一个任务的句柄。
透视事件的另一种方式是：root对象描述任务的主事件循环。通过root对象，任务代码可以访问它的上下文信息(magic)和线程同步，比如说等待对象、定时器，消息。
使用NUA服务的应用必须创建一个root对象，并设置处理NUA事件的回调函数。
调用 su_root_create()创建root对象 ...</div></div></div><div class="recent-post-item"><div class="post_cover right_radius"><a href="/2023/12/23/freeswitch/Sofia%E5%8F%91%E9%80%81subscriber%E7%9A%84%E6%BA%90%E7%A0%81%E8%A7%A3%E6%9E%90/" title="Sofia发送subscriber的源码解析"> <img class="post_bg" data-lazy-src="https://i.loli.net/2020/05/01/gkihqEjXxJ5UZ1C.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Sofia发送subscriber的源码解析"></a></div><div class="recent-post-info"><a class="article-title" href="/2023/12/23/freeswitch/Sofia%E5%8F%91%E9%80%81subscriber%E7%9A%84%E6%BA%90%E7%A0%81%E8%A7%A3%E6%9E%90/" title="Sofia发送subscriber的源码解析">Sofia发送subscriber的源码解析</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2023-12-23T12:48:25.000Z" title="发表于 2023-12-23 20:48:25">2023-12-23</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox article-meta__icon"></i><a class="article-meta__categories" href="/categories/freeswitch/">freeswitch</a></span></div><div class="content">本文将对 sofia 发送 subscriber 这个信令进行源码分析其中会对一些涉及到的其它源码进行解析，用以后续学习
Sofia 的 handle这里对 handle 进行一定的解释。这个 handle 用于管理向谁发送什么样的数据，这个谁一般指定 uac 。 一个 handle 会生成一个新的 call-id，产生一个新的 session。
nua_handle_destroy(): 用于销毁这个 handle。
小知识：FreeSWITCH 一般在创建后 nua_handle_bind(fnh, &mod_sofia_globals.destroy_private)，后续不用后会自动销毁, 这个销毁主要依赖于 our_sofia_event_callback中的以下代码：12345if ((sofia_private && sofia_private == &mod_sofia_globals.destroy_private)) { nua_handle_bind(nh, NULL); nua_handle ...</div></div></div><nav id="pagination"><div class="pagination"><span class="page-number current">1</span><a class="page-number" href="/page/2/">2</a><span class="space">…</span><a class="page-number" href="/page/7/">7</a><a class="extend next" rel="next" href="/page/2/"><i class="fas fa-chevron-right fa-fw"></i></a></div></nav></div><div class="aside_content" id="aside_content"><div class="card-widget card-info"><div class="card-content"><div class="card-info-avatar is-center"><img class="avatar-img" data-lazy-src="/img/100.jpg" onerror="this.onerror=null;this.src='/img/friend_404.gif'" alt="avatar"/><div class="author-info__name">hpng</div><div class="author-info__description">卖掉梦想，不一定换来柴米油盐！</div></div><div 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