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

Working with Call-legs (Dialogs) 71
Call-leg re-INVITE (Modify) State Machine
 Continue DNS—send an ACK request if the failure is because
of a 503 response, and try to send the request to the next address
in the transaction DNS list. For more information see the
Working with DNS chapter.
 Give up—send an ACK request if the failure is because of a 503
response, and terminate the re-INVITE object.
 Terminate the re-INVITE object.
RVSIP_CALL_LEG_MODIFY_STATE_ACK_RCVD
An ACK was received for a re-INVITE.
RVSIP_CALL_LEG_MODIFY_STATE_ACK_SENT
An ACK was sent for a re-INVITE.
RVSIP_CALL_LEG_MODIFY_STATE_TERMINATED
The final state of the re-INVITE object. Upon reaching this state, you can no
longer reference the re-INVITE object.
B
ASIC CALL-LEG RE-
INVITE (MODIFY) STATE
M
ACHINE
The following diagrams illustrate the Call-leg Re-Invite (Modify) state machine.
Figure 6-5 illustrates the basic state machine. Figure 6-6 illustrates the state
machine with message send failure and Figure 6-7 illustrates the state machine
with a network error or timeout.