📄 002_30.htm

📁 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=pg></DIV><!-- bitmap and vector images are written here -->
<DIV class=im0><IMG height=7 src="002_30.files/002_30_1.jpg" width=7 
border=0></DIV>
<DIV class=im1><IMG height=9 src="002_30.files/002_30_2.jpg" width=8 
border=0></DIV>
<DIV class=im2><IMG height=2 src="002_30.files/002_30_3.jpg" width=134 
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<DIV class=im5><IMG height=64 src="002_30.files/left.jpg" width=564 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR><SPAN 
class=ft0>图<SPAN class=em3>2-15 &nbsp;&nbsp;FULL_HEADER</SPAN>包中的<SPAN 
class=em3>CID</SPAN>和顺序</SPAN></NOBR></SPAN> <SPAN class=ps1><NOBR><SPAN 
class=ft1>COMPRESSED_UDP<SPAN class=em0>包格式说明了</SPAN>IP<SPAN 
class=em0>和</SPAN>UDP<SPAN class=em0>报头是压缩的，但在原封不动发送的</SPAN>RTP<SPAN 
class=em0>报</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps2><NOBR><SPAN 
class=ft2>头（或<SPAN class=em4>UDP</SPAN>之上的任何其他协议）中有差别。</SPAN></NOBR></SPAN> 
<SPAN class=ps3><NOBR><SPAN class=ft1>COMPRESSED_RTP<SPAN 
class=em0>包格式是，当报头压缩有效而且所有报头都是压缩报头时的正常报</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps4><NOBR><SPAN class=ft2>头类型。最小报头是<SPAN 
class=em4>2</SPAN>个字节，上增加的字节数是基于要传送给解压缩器的差值。</SPAN></NOBR></SPAN> <SPAN 
class=ps5><NOBR><SPAN class=ft1>CONTEXT_STATE<SPAN 
class=em0>包被解压缩器送回到压缩器，说明场景不同步，需要刷新。例如，情况</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps6><NOBR><SPAN class=ft2>可能是突发包丢失错误之后，在该错误中顺序编号的二阶差可能不为<SPAN 
class=em4>0<SPAN class=em0>，</SPAN></SPAN>需要刷新场景状态。</SPAN></NOBR></SPAN> <SPAN 
class=ps7><NOBR><SPAN class=ft2>如果希望发送非压缩的<SPAN class=em4>Ipv4 
ID</SPAN>域，可以发送可选的<SPAN 
class=em4>COMPRESSED_NON_TCP</SPAN>包格式。在</SPAN></NOBR></SPAN> <SPAN 
class=ps8><NOBR><SPAN class=ft2>大量包丢失的情况下，这会提高压缩协议的健壮性，但会导致压缩报头的最小值是<SPAN 
class=em4>4</SPAN>个字节。</SPAN></NOBR></SPAN> <SPAN class=ps9><NOBR><SPAN 
class=ft2>图<SPAN class=em4>2-16</SPAN>中是得到的压缩<SPAN 
class=em4>RTP</SPAN>包的报头。在压缩报头包的正常传输过程中，点线中的域不会</SPAN></NOBR></SPAN> <SPAN 
class=ps10><NOBR><SPAN class=ft2>发送。</SPAN></NOBR></SPAN> <SPAN 
class=ps11><NOBR><SPAN class=ft0>图<SPAN class=em3>2-16 
&nbsp;&nbsp;</SPAN>压缩<SPAN class=em3>RTP</SPAN>包的一般格式</SPAN></NOBR></SPAN> <SPAN 
class=ps12><NOBR><SPAN class=ft3>86&nbsp;&nbsp;<SPAN class=em1>IP </SPAN><SPAN 
class=em5>电话技术：稳定的</SPAN><SPAN class=em1>VoIP</SPAN><SPAN 
class=em5>服务集成</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps13><NOBR><SPAN 
class=ft4>这里假定的是<SPAN class=em6>Ipv4</SPAN>实现。如果读者正在考虑<SPAN 
class=em6>RTP</SPAN>的<SPAN class=em6>Ipv6</SPAN>实现，那么在设计时必须仔细遵守<SPAN 
class=em6>RFC</SPAN>的其他要求。</SPAN></NOBR></SPAN> <SPAN class=ps14><NOBR>IP 
Hdr<SPAN class=em2>长度域</SPAN></NOBR></SPAN> <SPAN class=ps15><NOBR>8<SPAN 
class=em2>比特</SPAN>CID</NOBR></SPAN> <SPAN class=ps16><NOBR>IP Hdr<SPAN 
class=em2>长度域</SPAN></NOBR></SPAN> <SPAN class=ps17><NOBR>16<SPAN 
class=em2>比特</SPAN>CID</NOBR></SPAN> <SPAN class=ps18><NOBR>UDP Hdr<SPAN 
class=em2>长度域</SPAN></NOBR></SPAN> <SPAN class=ps19><NOBR>UDP Hdr<SPAN 
class=em2>长度域</SPAN></NOBR></SPAN> <SPAN class=ps20><NOBR>CID<SPAN 
class=em2>的</SPAN>MSB(<SPAN class=em2>如果</SPAN>CID<SPAN 
class=em2>为</SPAN>16<SPAN class=em2>比特)</SPAN></NOBR></SPAN> <SPAN 
class=ps21><NOBR>CID<SPAN class=em2>的</SPAN>LSB</NOBR></SPAN> <SPAN 
class=ps22><NOBR><SPAN class=ft6>链路顺序</SPAN></NOBR></SPAN> <SPAN 
class=ps23><NOBR>CSRC<SPAN class=em2>列表</SPAN></NOBR></SPAN> <SPAN 
class=ps24><NOBR>RTP<SPAN class=em2>报头扩展</SPAN></NOBR></SPAN> <SPAN 
class=ps25><NOBR>RTP<SPAN class=em2>有效载荷</SPAN></NOBR></SPAN> <SPAN 
class=ps26><NOBR>PAD<SPAN class=em2>（</SPAN><SPAN 
class=em2>如果需要的话）</SPAN></NOBR></SPAN> <SPAN class=ps27><NOBR><SPAN 
class=ft6>如果M S T I&nbsp;=1</SPAN></NOBR></SPAN> <SPAN class=ps28><NOBR><SPAN 
class=ft6>，那</SPAN></NOBR></SPAN> <SPAN class=ps29><NOBR><SPAN 
class=ft6>么这里是M、S、T、</SPAN></NOBR></SPAN> <SPAN class=ps30><NOBR><SPAN 
class=ft6>I位的实际值的编码</SPAN></NOBR></SPAN> <SPAN class=ps31><NOBR>UDP<SPAN 
class=em2>校验和如果有的话</SPAN></NOBR></SPAN> <SPAN class=ps32><NOBR>M = RTP<SPAN 
class=em2>标志位</SPAN></NOBR></SPAN> <SPAN class=ps33><NOBR>S = RTP<SPAN 
class=em2>顺序编号</SPAN></NOBR></SPAN> <SPAN class=ps34><NOBR>T = RTP<SPAN 
class=em2>时间戳</SPAN></NOBR></SPAN> <SPAN class=ps35><NOBR>I = IPv4<SPAN 
class=em2>包</SPAN>ID</NOBR></SPAN> <SPAN class=ps36><NOBR><SPAN 
class=ft6>如果<SPAN class=em7>MSTI = 1111<SPAN 
class=em2>，</SPAN></SPAN>它表示后</SPAN></NOBR></SPAN> <SPAN class=ps37><NOBR><SPAN 
class=ft6>面是一个扩展的包报头</SPAN></NOBR></SPAN> <SPAN class=ps38><NOBR>IPv4ID<SPAN 
class=em2>的增量</SPAN></NOBR></SPAN> <SPAN class=ps39><NOBR>RTP<SPAN 
class=em2>顺序编号的增量</SPAN></NOBR></SPAN> <SPAN class=ps40><NOBR>RTP<SPAN 
class=em2>时间戳的增量</SPAN></NOBR></SPAN> <SPAN class=ps41><NOBR>RANDOM(<SPAN 
class=em2>用于包中有多个</SPAN></NOBR></SPAN> <SPAN class=ps42><NOBR>IPv4<SPAN 
class=em2>报头</SPAN>)<SPAN class=em2>，</SPAN><SPAN 
class=em2>发送时不会被压缩</SPAN></NOBR></SPAN> <SPAN class=ps43><NOBR><SPAN 
class=ft7>文档</SPAN></NOBR></SPAN> </BODY></HTML>
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