Update PDP Context Response

These messages are sent from the GGSN to the controller or vice versa.

The table below lists the message attributes.
Table 1. Update PDP context response attributes
Attribute Presence Type Description
Flags
  • Version
  • Protocol type
  • Spare bit
  • Extension header
  • Sequence number
  • N-PDU flag
M
  • Version - 1
  • PT - GTP (1)
  • Spare bit- 0
  • E - 0
  • S - 1
  • PN - 0
  • Version - Determines the version of the GTP protocol
  • Protocol type - Protocol discriminator between GTP (when PT is “1”) and GTP' (when PT is “0”)
  • Extension header - Indicates the presence of a meaningful value of the next extension header
  • Sequence number - Value of the sequence number
  • N-PDU Number - Value of the N-PDU number
Message Type M Integer Message type value is 19
Length M Integer This attribute indicates the payload length in octets.
TEID M Integer This attribute identifies a tunnel endpoint in the receiving GTP-U or GTP-C protocol entity
Sequence number O Integer This attribute is used as a transaction identity for signaling messages having a response message defined for a request message. This is the sequence number value, which is copied from the request to the response message header.
N-PDU number O Integer This attribute is used at the inter SGSN routing area update procedure and in the inter-system handover procedures. The controller sets this value to zero.
IMSI O Integer This attribute is the subscriber identity of the mobile subscriber. The value is set in this attribute for messages sent from controller to GGSN.
Recovery O Integer This attribute indicates if the peer GSN restarts. The value should equal to the value from the messages received from GGSN. This value is incremented and sent by the controller in case of a restart.
TEID Data I M Integer This attribute indicates the tunnel endpoint Identifier for data transmission, which is requested by the receiver of the message flow.
TEID Control Plane C Integer This indicates the tunnel endpoint identifier for the control plane. This attribute should be present, if the SGSN has not confirmed successful assignment of its Tunnel Endpoint Identifier Control Plane to the peer GGSN.
GSN Address M Integer This attribute is the controller address used for signaling.
Error Indication O Integer These messages are sent from the GGSN to the controller. Error Indication lists the message attribute.