Re: Event

answers inline.

Sudipta Ghosh wrote:
> Hi,
> When IM Client is sending a SUBSCRIPTION request( to a offline user )

The request method is SUBSCRIBE, not SUBSCRIPTION.

> for presence notification to proxy,proxy sends response with 200 OK but
> adds a event header.

The SUBSCRIBE request contains the Event header. It is not placed in the 
200 OK response. It is, however, placed in the NOTIFY request generated 
by the presence server.

> 
> Whats the meaning of it.

SIP has a general events framework (RFC 3265). A particular resource, 
such as sip:jdrosen <at> dynamicsoft.com, can support multiple types of 
events, including presence, message waiting indicators, dialog events, 
etc. The Event header disambiguates the event types being requested of 
the resource. See RFC 3265 for a complete discussion.

> 
> In REGISTER request there is also a Event header.

No, there is no Event header in REGISTER.

> I am sending the packets.(got from MSN Messenger communication service)