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List:       sip-implementors
Subject:    Re: [Sip-implementors] NOTIFY without SUBSCRIBE
From:       kishore sowdi <kishore_r_s () yahoo ! co ! in>
Date:       2007-12-12 9:03:03
Message-ID: 492555.48941.qm () web94103 ! mail ! in2 ! yahoo ! com
[Download RAW message or body]

section 3.2 of rfc 3265  says -
   
  "If any non-SUBSCRIBE mechanisms are defined to create subscriptions,it is the \
responsibility of the parties defining those mechanisms to ensure that correlation of \
a NOTIFY message to the corresponding subscription is possible.   
  Designers of such mechanisms are also warned to make a distinction between sending \
a NOTIFY message to a  subscriber who is aware of the subscription, and sending a \
NOTIFY message to an unsuspecting node.   
  The latter behavior is invalid, and MUST receive a "481 Subscription does not \
exist" response (unless some other 400- or 500-class error code is more applicable), \
as described in section 3.2.4.   
  In other words, knowledge of a subscription must exist in both the subscriber and \
the notifier to be valid, even if installed via a non-SUBSCRIBE mechanism".  
So sending 481 in this case is the correct behaviour ....
   
  
"Jack W. Lix" <jacklix@comcast.net> wrote: 
  Hi all,



Please confirm my understanding of subscribe for MWI. NOTIFY should not be
sent to a UA unless a SUBSCRIBE has been sent to it.



I'm doubting my understanding because I just got an asterisk server running
and it immediately sends a NOTIFY after I REGISTER with it. The NOTIFY does
not have "Subscription-State" header.



Request-Line: NOTIFY sip:jack@192.168.1.59 SIP/2.0

Message Header

Via: SIP/2.0/UDP 192.168.1.57:5060;branch=z9hG4bK03865702;rport

From: "asterisk" ;tag=as50084360

To: 

Contact: 

Call-ID: 20cc908d65c07b977767a16a19f71614@192.168.1.57

CSeq: 102 NOTIFY

User-Agent: Jacks_Asterisk

Max-Forwards: 70

Event: message-summary

Content-Type: application/simple-message-summary

Content-Length: 92

Message body

Messages-Waiting: no\r\n

Message-Account: sip:asterisk@192.168.1.57\r\n

Voice-Message: 0/0 (0/0)\r\n



How do other UA's handle such a situation. I'm currently responding with
481.



TIA,



Jack



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