| Article Index |
|---|
| Transaction layer operations in SIP |
| Page 2 |
| Page 3 |
| Page 4 |
| Page 5 |
| Page 6 |
| Page 7 |
| Page 8 |
| All Pages |
Page 6 of 8
17.1.4 Handling Transport Errors
|Request from TU
|send request
Timer E V
send request +-----------+
+---------| |-------------------+
| | Trying | Timer F |
+-------->| | or Transport Err.|
+-----------+ inform TU |
200-699 | | |
resp. to TU | |1xx |
+---------------+ |resp. to TU |
| | |
| Timer E V Timer F |
| send req +-----------+ or Transport Err. |
| +---------| | inform TU |
| | |Proceeding |------------------>|
| +-------->| |-----+ |
| +-----------+ |1xx |
| | ^ |resp to TU |
| 200-699 | +--------+ |
| resp. to TU | |
| | |
| V |
| +-----------+ |
| | | |
| | Completed | |
| | | |
| +-----------+ |
| ^ | |
| | | Timer K |
+--------------+ | - |
| |
V |
NOTE: +-----------+ |
| | |
transitions | Terminated|<------------------+
labeled with | |
the event +-----------+
over the action
to take
Figure 6: non-INVITE client transaction
When the client transaction sends a request to the transport layer to
be sent, the following procedures are followed if the transport layer
indicates a failure.
The client transaction SHOULD inform the TU that a transport failure
has occurred, and the client transaction SHOULD transition directly
to the "Terminated" state. The TU will handle the failover
mechanisms described in [4].
