Question

对话框和会话之间究竟有什么区别？对话是否意味着信号意义上的“已经设置了呼叫”，而会话意味着媒体意义上的“媒体已被设置”？

此外，“对话的一部分”是什么意思？是“邀请”，“确认”和回答被认为是“对话的一部分”？

Answer 1

 Dialog: A dialog is a peer-to-peer SIP relationship between two
     UAs that persists for some time.  A dialog is established by
     SIP messages, such as a 2xx response to an INVITE request.  A
     dialog is identified by a call identifier, local tag, and a
     remote tag.  A dialog was formerly known as a call leg in RFC
     2543.

，而

  Session: From the SDP specification: "A multimedia session is a
     set of multimedia senders and receivers and the data streams
     flowing from senders to receivers.  A multimedia conference is
     an example of a multimedia session." (RFC 2327 [1]) (A session
     as defined for SDP can comprise one or more RTP sessions.)  As
     defined, a callee can be invited several times, by different
     calls, to the same session.  If SDP is used, a session is
     defined by the concatenation of the SDP user name, session id,
     network type, address type, and address elements in the origin
     field.

用我自己的话说：SIP对话框指的是两个对等体之间的信令关系。 SIP对话框可用于建立呼叫（INVITE），但还有其他SIP方法可以建立对话（例如SUBSCRIBE）

通过INVITE方法发起的SIP对话交换（多媒体）会话，使用SDP提供/回答（参见RFC 3264）

SIP中对话和会话的区别？

1 个答案: