Collapsed Call Attach with SGW-Service to SMF-Service Configuration Call Flow
This section describes the Collapsed Call Attach with SGW-Service to SMF-Service Configuration call flow.

Step |
Description |
---|---|
1 |
MME sends the Create Session Request to GTP-S11. |
2 |
GTP-S11 sends the Create Session Request to SGW-SRV. |
3 |
SGW-SRV sends the Sx Session Establishment Request to PFCP. |
4 |
PFCP sends the Sx Session Establishment Request to cnSGWu/SMFu. |
5 |
cnSGWu/SMFu sends the Sx Session Establishment Response to PFCP. |
6 |
PFCP sends the Sx Session Establishment Response to SGW-SRV. |
7 |
SGW-SRV sends the Create Session Request to SMF. The Service Short Circuit is set to TRUE. |
8 |
SMF sends the Create Session Response to SGW-SRV. |
9 |
SGW-SRV sends the Sx Session Modify Request to PFCP. |
10 |
PFCP sends the Sx Session Modify Request to cnSGWu/SMFu. |
11 |
cnSGWu/SMFu sends the Sx Session Modify Response to PFCP. |
12 |
PFCP sends the Sx Session Modify Response to SGW-SRV. |
13 |
SGW-SRV sends the Create Session Response to GTP-S11. |
14 |
GTP-S11 sends the Create Session Response to MME. For a collocated subscriber, when SGW-SRV receives:
|