Section: Resume Notification
Content: The Resume Notification message should be sent on the S11 interface by the MME to the SGW and forwarded on the S5/S8 interface by the SGW to the PGW as part of the resume procedure returning back to E-UTRAN in the case of CS fallback or SRVCC. The Resume Notification message should also be sent on the S4 interface by the SGSN to the SGW and forwarded on the S5/S8 interface by the SGW to the PGW as part of the resume procedure returning from SRVCC to HSPA if there is no Modify Bearer Request message sent to the SGW and PGW as specified in 3GPP TS 23.216[ Single Radio Voice Call Continuity (SRVCC); Stage 2 ]  [43]. The SGW may also send a Resume Notification message to the PGW on the S5/S8 interface upon receipt from the MME/S4-SGSN of a (non-empty) Modify Bearer Request used as an implicit resume of the suspended bearers in the SGW and in the PGW (see 3GPP TS 23.216[ Single Radio Voice Call Continuity (SRVCC); Stage 2 ]  [43] clauses 6.2.2.1 and 6.3.2.1, 3GPP TS 23.272[ Circuit Switched (CS) fallback in Evolved Packet System (EPS); Stage 2 ]  [21] clauses 6.3, 6.5 and 7.4) if the conditions of presence of the IEs in the Modify Bearer Request specified in table 7.2.7-1 do not require any IE to be sent over S5/S8 to the PGW. NOTE: This is an alternative to sending over S5/S8 a Modify Bearer Request used as an implicit resume with zero IE(s), see clause 7.2.7. After receiving a Resume Notification message or a Modify Bearer Request used as an implicit resume of the suspended bearers, the SGW/PGW clears suspended status for all the non-GBR bearers. The PGW shall forward packets it receives for the UE. If the suspended bearers are of the type S4-U GTP-U, the SGW shall forward over the S4-U interface, packets it receives for the UE, upon receipt of Resume Notification. Table 7.4.3-1 specifies the presence requirements and conditions of the IEs in the message. Table -1: Information Element in Resume Notification