HP-UX C SIP Stack Programmer's Guide (Novembery 2007)

Event Notification 265
Support for Subscription Forking
Figure 12-9 Subscription Forking Message Flow
Subscriber Proxy Notifier A Notifier B
SUBSCRIBE
From tag: Y
Subscription A
(original)
From tag: Y
To tag: None
SUBSCRIBE
From tag: Y
200 OK
From tag: Y
To tag: U
200 OK
From tag: Y
To tag: U
Discard
NOTIFY (active)
From tag: U
To tag: Y
NOTIFY (active)
From tag: U
To tag: Y
200 OK
From tag: Y
To tag: W
SUBSCRIBE
From tag: Y
NOTIFY (active)
From tag: W
To tag: Y
NOTIFY (active)
From tag: W
To tag: Y
Subscription B
(forked)
From tag: Y
To tag: W
Subscription B
(forked)
From tag: Y
To tag: U