[SIPForum-discussion] Difference between SIP Dialogue and SIP Session

Tomasz Zieleniewski tzieleniewski at gmail.com
Fri Jun 19 13:18:37 UTC 2009


Dialog represents a temporary end to end context between two SIP
User Agents. It is established through SIP message exchanges like
for instance INVITE request and 200 OK response.

Session is a different thing, it is also temporary but it represents
a set of entities (senders and receivers) and data streams exchanged
between them.

So generally we can say that Dialog reflects a logical control plane
state while Session reflects media plane state.

So at the same time we can say that there can be a Session related
to the Dialog (i.e. ongoing call between two UAs) or that there can be
many Dialogs related to the Session (i.e. conference bridge between many

Kind regards,
- Tomasz Zieleniewski

2009/6/17 raja sekar <rajasekar.dhanasekar at yahoo.co.in>

> Hi All,
> Good Evening!
> Can any one tell me the difference between SIP Dialogue and SIP Session.
> Thanks in advance!
> Regards,
> Rajasekar Dhanasekaran.
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