What is "inside dialog" and "outside dialog"

最新推荐文章于 2024-07-16 17:30:00 发布

转载最新推荐文章于 2024-07-16 17:30:00 发布 · 305 阅读

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本文解释了SIP中对话的概念及其如何通过Call-ID、To-tag及From-tag来标识两个端点之间的关系。并详细说明了再邀请(Re-Invite)、BYE等消息被视为对话内消息的原因，同时阐述了初始邀请为何被认为是对话外消息。

Well to understand the difference between inside and outside dialog, I guess you need to understand what a dialog is. 
A dialog is a relationship between two endpoints which is identified by a combination of the callid, to-tag and from-tag.
So for example messages like Re-Invite, BYE are considered as in-dialog messages as they can be identified by those three parameters
Whereas an Initial Invite can be considered as an out-of-dialog message.(reason being we are still waiting for a response with the to-tag and a dialog has not been formed yet).