Subject: RE: [Sip] NOTIFY

From: [email-masked]
Date: Wed, 30 Oct 2002 10:51:37 +0200

Hi,

Inline

> -----Original Message-----
> From: ext Cristian Popa [mailto:[email-masked]]
> Sent: 30 October, 2002 09:51
> To: [email-masked]
> Subject: [Sip] NOTIFY
> 
> 
> Hello,
> 
> SUBSCRIBE request is answered with 200 response and
> the notifier immediately sends NOTIFY request to the
> subscriber.

yes

> Problem is that NOTIFY could arrive at the subscriber
> before 200 OK, case in which I assume the subscriber
> will give a non-200 OK to the NOTIFY and the
> subscription will be cancelled.

UAs must be prepared to accept NOTIFY message before subscription transaction has completed. This behavior is described in RFC3265. See sections 3.1.4.4 and 3.2.4.

> Should the proxy implement a mechanism to assure that
> 200-ok is the first to arrive to the subscriber? 

No. This is not needed. 

Best Regards
- Mikko

> Thank you for your help.
> Cristian
> 
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