Message Flows
....................................................................................................................................................................................................................................
Figure 3-5, “Successful Call Completion Message Flow” (3-15)
illustrates ISUP and SIP messages sent between network elements in
order to successfully setup and tear down a call between two
subscribers.
Figure 3-5 Successful Call Completion Message Flow
Originating Terminating
Switch OPS TPS Switch
| --IAM-> | | |
| | ------INVITE-----> | |
| | | --IAM-> |
||183 SESSION ||
| | <----PROGRESS----- | |
| | ------UPDATE-----> | |
||<-200 OK (UPDATE)-| |
| | | <-ACM-- |
| | <---180 RINGING--- | |
| <-ACM-- | | |
| | | <-ANM-- |
||<-200 OK (INVITE)-| |
| <-ANM-- | | |
||
| Talking Path Available |
||
| --REL-> | | |
| | --------BYE------> | |
| | | --REL-> |
| | <--200 OK (BYE)--- | |
Overview
There are many possible message flows for successful SIP calls, for
various network configurations and SIP protocol options. This section
illustrates three likely message flows, with different configurations and
options provisioned.
Message Flow 1
This message flow is a straightforward packet trunking scenario
between a 5ESS
®
switch OPS and 5ESS
®
switch TPS in the PSTN,
where the call originates from an ISUP trunk in the PSTN at the OPS,
and terminates to an ISUP trunk in the PSTN at the TPS. Refer to
Figure 3-6, “ 5ESS
®
Switch OPS - 5ESS
®
Switch TPS Message Flow”
(3-17).
Call Flow
....................................................................................................................................................................................................................................
235-200-118
Issue 3.02B, March 2007
Lucent Technologies
3-15
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