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

Working with Register-Clients 139
Register-Client State Machine
RVSIP_REG_CLIENT_STATE_MSG_SEND_FAILURE
This state is assumed only if the SIP Stack works with the Enhanced DNS
feature. The register-client moves to this state when it failed to send a request
(the register-client received a network error, 503 response or time-out on the
request). In this state your application can:
 Continue DNS—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—return to the previous state of the register-client and
not send the request. For more information see the Working
with DNS chapter.
 Terminate the register-client.
This state can be reached from the REGISTERING state only.
M
ESSAGE SEND FAILURE
STATE MACHINE
The following state machine is part of the Register-Client state machine and is
shown here separately for simplicity. The Message Send Failure state machine
shows how the RVSIP_REG_CLIENT_STATE_MSG_SEND_FAILURE state
is reached.
Figure 8-2 Message Send Failure State Machine
REGSITERING
MSG SEND FAILURE
TERMINATED
REGISTERED
Terminate() /
GiveUp()--on initial registration
GiveUp()--
on refresh
registration
2xx rcvd
ContinueDNS(),
ResendRequest()
Timeout /
Network Error/
503 response