SIP without Encapsulated ISUP - Message Flow
....................................................................................................................................................................................................................................
Figure 3-16, “SIP without Encapsulated ISUP Successful Call” (3-49)
illustrates the message flow using the SIP without Encapsulated ISUP
feature. These are the messages sent between network elements in
order to successfully setup and tear down a call between two
subscribers. This example is a PSTN to IP call, with Preconditions
and an INVITE without IAM.
Figure 3-16 SIP without Encapsulated ISUP Successful Call
Originating Terminating
Switch OPS TPS Switch
| --IAM-> | | |
| | ---INVITE {SDP}--> | |
| | | --IAM--> |
||183 SESSION ||
||<-PROGRESS {SDP}-- | |
|| | |
| | ---UPDATE {SDP}--> | |
|| | |
||200 OK (UPDATE) ||
| | <------{SDP}------ | |
| | | <--ACM---- |
| | <---180 RINGING--- | |
| <-ACM-- | | |
| | | <--ANM--- |
||<-200 OK (INVITE)-| |
| <-ANM-- | | |
| | ------ ACK ------> | |
||
| <----- Talking Path Available -------> |
||
| --REL-> | | |
| | ------ BYE ------> | |
| | | ---REL--> |
| | <--200 OK (BYE)--- | |
|| | |
Call Flow
....................................................................................................................................................................................................................................
235-200-118
Issue 3.02B, March 2007
Lucent Technologies
3-49
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