Section: 4.2.2.2 Triggered Messages
Content: The IP Destination Address of a GTPv2 Triggered message and for a Triggered Reply message shall be copied from the IP Source Address of the message to which this GTPv2 entity is replying, except in the case of the SGSN pool scenario. The IP Source Address of a GTPv2 Triggered message and for a Triggered Reply message shall be copied from the IP destination address of the message to which this GTPv2 entity is replying, except in the case of SGSN pool scenario and handover scenario when the CIoT feature is deployed. In the SGSN pool scenario, if the Identification Request, the Context Request or the Suspend Notification messages have been forwarded by another SGSN in the pool, the IP Source address for the Identification Response, the Context Response or the Suspend Acknowledge messages shall be locally allocated by the sending GTP entity. The IP Destination Address for the Identification Response, the Context Response or the Suspend Acknowlegde messages shall be determined in the following way. The value from the information element "Address for Control Plane", which was sent in the corresponding Identification Request or the Suspend Notification message; or the value from the information element "S3/S16/S10 Address and TEID for Control Plane", which was sent in the corresponding Context Request message, shall be copied into the IP Destination Address field. In the handover scenario when the CIoT feature is deployed, if the Forward Relocation Request message has been forwarded by the target MME, the IP Source address of the Forward Relocation Response shall be locally allocated by the sending GTP entity. The IP Destination Address field of the Forward Relocation Response shall be set to the value of the "Sender's F-TEID for Control Plane" IE received in the Forward Relocation Request message.