Section: 6.1.3.7 Protocol configuration options
Content: The MS and the GGSN may communicate parameters by means of the protocol configuration options information element or extended protocol configuration options information element when activating, modifying or deactivating a PDP context. Such parameters can e.g. be used to convey information from external protocols between the MS and the GGSN. An overview of how the protocol configuration options information element is used is specified in 3GPP TS 27.060[ Packet domain;  Mobile Station (MS) supporting Packet Switched services ]  [36a]. The protocol configuration options information element and the extended protocol configuration options information element is transparent to the SGSN. NOTE 1: The MS and the network negotiate support of the extended protocol configuration options IE end-to-end for each PDN connection, as the information element can only be used if it is supported also by the GGSN/PDN GW. If supported by the network and the MS end-to-end for a PDN connection, protocol configuration options shall be exchanged via the extended protocol configuration options IE. Otherwise the protocol configuration options IE is used. For the MS, the extended protocol configuration options is supported by the network and the MS end-to-end for a PDN connection if the network has indicated support of the extended protocol configuration options IE in the last ATTACH ACCEPT or ROUTING AREA UPDATING ACCEPT message, and - the PDP Type requested for the default PDP context is non-IP; or - the network has included the extended protocol configuration options IE in at least one session management message received by the MS for this PDN connection. For the SGSN, the extended protocol configuration options is supported by the network and the MS end-to-end for a PDN connection if the MS has indicated support of the extended protocol configuration options IE in the last ATTACH REQUEST or ROUTING AREA UPDATING REQUEST message, and - the PDP Type requested for the default PDP context is non-IP; or - the SGSN has received the extended protocol configuration options IE in at least one message sent by the GGSN or PDN GW towards the MS for this PDN connection (for details see 3GPP TS 29.274[ 3GPP Evolved Packet System (EPS); Evolved General Packet Radio Service (GPRS) Tunnelling Protocol for Control plane (GTPv2-C); Stage 3 ]  [16D]). NOTE 2: For the GGSN or PDN GW, the extended protocol configuration options is supported by the network and the MS end-to-end for a PDN connection if: - the GGSN initiates a network requested PDP context activation with offered PDP Type non-IP; or - the last support indication received from the SGSN or S-GW indicates that extended protocol configuration options is supported for this PDN connection (for details see 3GPP TS 29.274[ 3GPP Evolved Packet System (EPS); Evolved General Packet Radio Service (GPRS) Tunnelling Protocol for Control plane (GTPv2-C); Stage 3 ]  [16D]).