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📁 通讯类的标准。对要开发SS7的朋友有很大帮助的。（通讯协议）
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<DIV class=im6><IMG height=64 src="002_21.files/right.jpg" width=563 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR><SPAN 
class=ft0>了传输控制数字，要在不可靠的传输协议上运行<SPAN 
class=em2>RTP</SPAN>。包的有效载荷的格式和类型必须通过</SPAN></NOBR></SPAN> <SPAN 
class=ps1><NOBR><SPAN class=ft0>信令协议动态分配。</SPAN></NOBR></SPAN> <SPAN 
class=ps2><NOBR><SPAN class=ft0>在<SPAN 
class=em2>DTMF</SPAN>识别和传输中的查找问题涉及键盘上数字按下的持续时间的传送方式，以及检测</SPAN></NOBR></SPAN> 
<SPAN class=ps3><NOBR><SPAN 
class=ft0>到的音调的音量。后者是在发起端点处检测到的音量，可以很容易地用一种新的有效载荷格</SPAN></NOBR></SPAN> <SPAN 
class=ps4><NOBR><SPAN 
class=ft0>式携带。音调的持续时间必须清晰地标识出来，以便接收端点能把它播放出来。这就导致了</SPAN></NOBR></SPAN> <SPAN 
class=ps5><NOBR><SPAN class=ft0>两个问题。首先是必须检测到整个<SPAN 
class=em2>DTMF</SPAN>音调，直到切断点为止，而且必须产生一个包。如</SPAN></NOBR></SPAN> <SPAN 
class=ps6><NOBR><SPAN class=ft0>果<SPAN class=em2>DTMF</SPAN>用于用户信令，例如请求<SPAN 
class=em2>Class 5</SPAN>特性，那么过多的延迟可能是不理想的。在第<SPAN 
class=em2>4</SPAN>章中，</SPAN></NOBR></SPAN> <SPAN class=ps7><NOBR><SPAN 
class=ft0>我们将讨论网络中与音调产生和传输的质量有关的测量。</SPAN></NOBR></SPAN> <SPAN 
class=ps8><NOBR><SPAN class=ft1>5. RTP<SPAN 
class=em3>对电话信号事件和音调的支持</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps9><NOBR><SPAN 
class=ft0>因特网草案<SPAN class=em2>&lt;ietf-avt-tones-00.txt&gt;</SPAN>中定义了在<SPAN 
class=em2>RTP</SPAN>包中传输电话信号、音调和事件的</SPAN></NOBR></SPAN> <SPAN 
class=ps10><NOBR><SPAN class=ft1>RTP<SPAN 
class=em4>包有效载荷的格式。标准的基本方向是规定音调信号特性的编码，并将它们传输给远程</SPAN></SPAN></NOBR></SPAN> 
<SPAN class=ps11><NOBR><SPAN class=ft0>端点以进行音调重建。</SPAN></NOBR></SPAN> <SPAN 
class=ps12><NOBR><SPAN class=ft0>表<SPAN 
class=em2>2-3</SPAN>中列出了必须识别的信令事件和音调，这里只是作为参考，这只是对一般性、多国</SPAN></NOBR></SPAN> 
<SPAN class=ps13><NOBR><SPAN class=ft0>家、基于<SPAN 
class=em2>IP</SPAN>网络中类别服务和基本电话技术的健壮集成中的问题重要程度的证明。</SPAN></NOBR></SPAN> <SPAN 
class=ps14><NOBR><SPAN class=ft2>表<SPAN class=em5>2-3 
&nbsp;&nbsp;</SPAN>用于音调和信令事件的<SPAN 
class=em5>RTP</SPAN>有效载荷类型</SPAN></NOBR></SPAN> <SPAN 
class=ps15><NOBR>有效载荷编码</NOBR></SPAN> <SPAN class=ps16><NOBR>定</NOBR></SPAN> 
<SPAN class=ps17><NOBR>义</NOBR></SPAN> <SPAN class=ps18><NOBR>事件类型</NOBR></SPAN> 
<SPAN class=ps19><NOBR><SPAN class=ft4>DTMF<SPAN 
class=em0>音调和信号（编码名称是</SPAN>dtmf<SPAN class=em0>，</SPAN>MIME<SPAN 
class=em0>名称是</SPAN>audio/dtmf<SPAN class=em0>）</SPAN></SPAN></NOBR></SPAN> 
<SPAN class=ps20><NOBR><SPAN class=ft4>0</SPAN></NOBR></SPAN> <SPAN 
class=ps21><NOBR>（<SPAN class=em1>DTMF</SPAN>）<SPAN 
class=em1>0</SPAN></NOBR></SPAN> <SPAN class=ps22><NOBR><SPAN 
class=ft4>1</SPAN></NOBR></SPAN> <SPAN class=ps23><NOBR>（<SPAN 
class=em1>DTMF</SPAN>）<SPAN class=em1>1</SPAN></NOBR></SPAN> <SPAN 
class=ps24><NOBR><SPAN class=ft4>2</SPAN></NOBR></SPAN> <SPAN 
class=ps25><NOBR>（<SPAN class=em1>DTMF</SPAN>）<SPAN 
class=em1>2</SPAN></NOBR></SPAN> <SPAN class=ps26><NOBR><SPAN 
class=ft4>3</SPAN></NOBR></SPAN> <SPAN class=ps27><NOBR>（<SPAN 
class=em1>DTMF</SPAN>）<SPAN class=em1>3</SPAN></NOBR></SPAN> <SPAN 
class=ps28><NOBR><SPAN class=ft4>4</SPAN></NOBR></SPAN> <SPAN 
class=ps29><NOBR>（<SPAN class=em1>DTMF</SPAN>）<SPAN 
class=em1>4</SPAN></NOBR></SPAN> <SPAN class=ps30><NOBR><SPAN 
class=ft4>5</SPAN></NOBR></SPAN> <SPAN class=ps31><NOBR>（<SPAN 
class=em1>DTMF</SPAN>）<SPAN class=em1>5</SPAN></NOBR></SPAN> <SPAN 
class=ps32><NOBR><SPAN class=ft4>6</SPAN></NOBR></SPAN> <SPAN 
class=ps33><NOBR>（<SPAN class=em1>DTMF</SPAN>）<SPAN 
class=em1>6</SPAN></NOBR></SPAN> <SPAN class=ps34><NOBR><SPAN 
class=ft4>7</SPAN></NOBR></SPAN> <SPAN class=ps35><NOBR>（<SPAN 
class=em1>DTMF</SPAN>）<SPAN class=em1>7</SPAN></NOBR></SPAN> <SPAN 
class=ps36><NOBR><SPAN class=ft4>8</SPAN></NOBR></SPAN> <SPAN 
class=ps37><NOBR>（<SPAN class=em1>DTMF</SPAN>）<SPAN 
class=em1>8</SPAN></NOBR></SPAN> <SPAN class=ps38><NOBR><SPAN 
class=ft4>9</SPAN></NOBR></SPAN> <SPAN class=ps39><NOBR>（<SPAN 
class=em1>DTMF</SPAN>）<SPAN class=em1>9</SPAN></NOBR></SPAN> <SPAN 
class=ps40><NOBR><SPAN class=ft4>10</SPAN></NOBR></SPAN> <SPAN 
class=ps41><NOBR>（<SPAN class=em1>DTMF</SPAN>）<SPAN 
class=em1>A</SPAN></NOBR></SPAN> <SPAN class=ps42><NOBR><SPAN 
class=ft4>11</SPAN></NOBR></SPAN> <SPAN class=ps43><NOBR>（<SPAN 
class=em1>DTMF</SPAN>）<SPAN class=em1>B</SPAN></NOBR></SPAN> <SPAN 
class=ps44><NOBR><SPAN class=ft4>12</SPAN></NOBR></SPAN> <SPAN 
class=ps45><NOBR>（<SPAN class=em1>DTMF</SPAN>）<SPAN 
class=em1>C</SPAN></NOBR></SPAN> <SPAN class=ps46><NOBR><SPAN 
class=ft4>13</SPAN></NOBR></SPAN> <SPAN class=ps47><NOBR>（<SPAN 
class=em1>DTMF</SPAN>）<SPAN class=em1>D</SPAN></NOBR></SPAN> <SPAN 
class=ps48><NOBR><SPAN class=ft4>14</SPAN></NOBR></SPAN> <SPAN 
class=ps49><NOBR>（<SPAN class=em1>DTMF</SPAN>）<SPAN 
class=em1>*</SPAN></NOBR></SPAN> <SPAN class=ps50><NOBR><SPAN 
class=ft4>15</SPAN></NOBR></SPAN> <SPAN class=ps51><NOBR>（<SPAN 
class=em1>DTMF</SPAN>）<SPAN class=em1>#</SPAN></NOBR></SPAN> <SPAN 
class=ps52><NOBR><SPAN class=ft4>16</SPAN></NOBR></SPAN> <SPAN 
class=ps53><NOBR><SPAN class=ft4>Flash<SPAN 
class=em0>挂机</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps54><NOBR>传真音调和信号</NOBR></SPAN> <SPAN class=ps55><NOBR><SPAN 
class=ft4>1</SPAN></NOBR></SPAN> <SPAN class=ps56><NOBR><SPAN class=ft4>ANS<SPAN 
class=em0>（</SPAN><SPAN class=em0>传真应答音调）</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps57><NOBR><SPAN class=ft4>2</SPAN></NOBR></SPAN> <SPAN 
class=ps58><NOBR><SPAN class=ft4>ANSam<SPAN class=em0>（</SPAN>V.34<SPAN 
class=em0>传真）</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps59><NOBR><SPAN 
class=ft5>第<SPAN class=em6>2</SPAN>章&nbsp;包网络的介质传输</SPAN></NOBR></SPAN> <SPAN 
class=ps60><NOBR><SPAN class=ft6>77</SPAN></NOBR></SPAN> <SPAN 
class=ps61><NOBR>工作正在进行中，其内容和状态可能会改变。</NOBR></SPAN> <SPAN class=ps62><NOBR><SPAN 
class=ft4>PT 16<SPAN class=em0>中的</SPAN>DTMF<SPAN 
class=em0>音调。</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps63><NOBR><SPAN 
class=ft4>RTP<SPAN class=em0>包报头中的有效载荷类型必须由信</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps64><NOBR>令协议动态指定，并且为每种事件分别指</NOBR></SPAN> <SPAN 
class=ps65><NOBR>定</NOBR></SPAN> <SPAN 
class=ps66><NOBR>这些信号的定义请参见传真说明部分，</NOBR></SPAN> <SPAN 
class=ps67><NOBR>同时还要注意这部分中其他的说明。</NOBR></SPAN> <SPAN class=ps68><NOBR><SPAN 
class=ft7>文档</SPAN></NOBR></SPAN> </BODY></HTML>

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