What is the difference between SIP PUBLISH and SIP SUBSRIBE

You only need PUBLISH, if there's a presence server that
accepts
publications. That server is probably the same entity that
accepts
subscriptions and sends notifications, too.

I'd say you need to support PUBLISH.

Cheers,
Aki

ext Abhijit A. Mahajani wrote:
> Hi Sudhir,
> Thanks. I perfectly agree.
> But if i have not implemented PUBLISH, still i
SUBSCRIBE for some body,
> then will i get any NOTIFICATION?
> in simple words: I am implementing Instant messaging
and presence in my
> SIP stack. Do I need to implemetn PUBLISH? is it
mandatory?
>  
> Regards.
> Abhijit
> 
>     ----- Original Message -----
>     *From Sudhir
<mailto:t.sudhirkrishnagmail.com>
>     *To Abhijit A.
Mahajani <mailto:abhijit_mcitilindia.com>
>     *Sent Friday,
March 17, 2006 4:35 PM
>     *Subject Re:
[Simple] What is the difference between SIP PUBLISH
>     and SIP SUBSRIBE
> 
>     Hi Abhijit,
>      
>     The PUBLISH is used to publish ur presence status
to the server.
>     when any user send SUBSCRIBE to know abt u ... the
server send the
>     status to user which u send in the PUBLISH.
>      
>     i hope i'm clear. if not get badck to me
>     \regards
>     sudhir
> 
>      
>     On 3/17/06, *Abhijit A. Mahajani* <abhijit_mcitilindia.com
>     <mailto:abhijit_mcitilindia.com>>
wrote:
> 
>         Hi
>         What is the difference between the following
SIP Methods:
>         PUBLISH and SUBSCRIBE?
>         Is it mandatory to implement PUBLISH in
presence implementation?
>         Thanks and REgards.
>         Abhijit
> 
>         _______________________________________________
>         Simple mailing list
>         Simpleietf.org <mailto:Simpleietf.org>
>         https:/
/www1.ietf.org/mailman/listinfo/simple
> 
> 
> 
> 
>
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To be clear, there is no specification that says you
"MUST" implement  
PUBLISH to do presence. It really comes down to an
architectural  
decision. If you want presentities to be able to push their
presence  
information to a central presence server, you need PUBLISH.
If you  
want to build a server or client that interoperates with
other  
servers and/or clients, then PUBLISH is certainly a good
idea.

But PUBLISH is not explicitly needed to make SUBSCRIBE work.
You can  
have a device that consumes presence, but does not publish
it--in  
which case that device would not need to implement PUBLISH.

On Mar 17, 2006, at 5:12 AM, Abhijit A. Mahajani wrote:

> Hi Sudhir,
> Thanks. I perfectly agree.
> But if i have not implemented PUBLISH, still i
SUBSCRIBE for some  
> body, then will i get any NOTIFICATION?
> in simple words: I am implementing Instant messaging
and presence  
> in my SIP stack. Do I need to implemetn PUBLISH? is it
mandatory?
>
> Regards.
> Abhijit
> ----- Original Message -----
> From: Sudhir
> To: Abhijit A. Mahajani
> Sent: Friday, March 17, 2006 4:35 PM
> Subject: Re: [Simple] What is the difference between
SIP PUBLISH  
> and SIP SUBSRIBE
>
> Hi Abhijit,
>
> The PUBLISH is used to publish ur presence status to
the server.  
> when any user send SUBSCRIBE to know abt u ... the
server send the  
> status to user which u send in the PUBLISH.
>
> i hope i'm clear. if not get badck to me
> \regards
> sudhir
>
>
> On 3/17/06, Abhijit A. Mahajani <abhijit_mcitilindia.com> wrote:
> Hi
> What is the difference between the following SIP
Methods:
> PUBLISH and SUBSCRIBE?
> Is it mandatory to implement PUBLISH in presence
implementation?
> Thanks and REgards.
> Abhijit
>
> _______________________________________________
> Simple mailing list
> Simpleietf.org
> https:/
/www1.ietf.org/mailman/listinfo/simple
>
>
>
> _______________________________________________
> Simple mailing list
> Simpleietf.org
> https:/
/www1.ietf.org/mailman/listinfo/simple


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