sip不分配多波地址、也不保留资源，但它能把做到这点所必要的信息传递给被邀请的系统。
SIP does not allocate multicast addresses and it does not reserve resources, but it can convey to the invited system the information necessary to do this.
CDMA蜂窝移动通信系统是一种采用多址技术的通信系统，即采用不同的地址码来区分用户、基站和信道。
CDMA mobile communication system adopts multiple access techniques which means different address codes are used to distinguish users, base stations and channels.
“要比系统给的最大地址长度至少要多16个字节”，而我的代码没有多这16个字节，问题就出在这里，修改一下，再运行，就没问题了；
The number of bytes reserved for the remote address information. This value must be at least 16 bytes more than the maximum address length for the transport protocol in use. Cannot be zero.
“要比系统给的最大地址长度至少要多16个字节”，而我的代码没有多这16个字节，问题就出在这里，修改一下，再运行，就没问题了；
The number of bytes reserved for the remote address information. This value must be at least 16 bytes more than the maximum address length for the transport protocol in use. Cannot be zero.
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