IP Address Exhaustion Handling Call Flow for 4G Sessions
This section describes how the SMF handles the IP address exhaustion condition in a 4G session.
The following figure illustrates the IP address exhaustion handling call flow for 4G sessions.

Step |
Description |
---|---|
1 |
SGW-C sends the Create Session Request to PGW-C. |
2 |
Upon detecting the exhaustion of IP address in a 4G call, the PGW-C reads the configured back-off timer value and cause. Then, PGW-C sends this timer value and cause in the Create Session Response message to SGW-C. |