[SIPForum-discussion] What is "inside dialog" and "outside dialog"

[Vikas Singhal (vsinghal)]

In simple words :

Some messages establish a dialog and some do not. This allows to explicitly express the relationship of messages and also to send messages that are not related to other messages outside a dialog. That is easier to implement because user agent don't have to keep the dialog state.

For instance, INVITE message establishes a dialog, because it will be later followed by BYE request which will tear down the session established by the INVITE. This BYE is sent within the dialog established by the INVITE.

But if a user agent sends a MESSAGE request, such a request doesn't establish any dialog. Any subsequent messages (even MESSAGE) will be sent independently of the previous one.
--Vikas

From: discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] On Behalf Of Khoa Pham
Sent: Monday, January 14, 2013 11:23 AM
To: discussion at sipforum.org
Subject: [SIPForum-discussion] What is "inside dialog" and "outside dialog"

When reading SIP, I often encounter these two terminologies. Sometimes they say "Sending request inside dialog", sometimes they say "Sending request outside dialog".

So what do they mean ?

--
Khoa Pham
HCMC University of Science
Faculty of Information Technology
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