Subject: RE: [Sip] Simple question about NOTIFY

From: "Brett Tate" <[email-masked]>
Date: Thu, 26 Jun 2003 15:27:25 -0400

> As I am reading through the two RFCs 3261, 
> and 3265, I am just wondering if a 
> SIP NOTIFY can be forked? 

Yes a NOTIFY can be forked.

> Also if it can be forked, can someone please 
> explain how will that work, since NOTIFY 
> would be sent in a dialog, and according to 
> the rules set in section 12 of RFC 3261, 
> the Request-URI would need to be set to the 
> remote target (which is the contact address 
> of the subscriber), and a Proxy is just 
> supposed to forward to that target.

Requests can fork within a dialog during
fault-tolerant/redundancy situations where
a device's added Contact or Record-Route entry
resolves to multiple address.  ICMP errors
or retry exhaustion can trigger the target
advancing.

The NOTIFY can also fork outside of dialog
when the "subscription" was not established
through the typical SIP mechanisms.  RFC 3265 
section 3.2 discusses subscriptions created 
by not using a SUBSCRIBE.

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