Section: 8.94 Additional Protocol Configuration Options (APCO)
Content: The Additional Protocol Configuration Options (APCO) information element is used to exchange additional protocol configuration options between the TWAN/ePDG and the PGW. The Additional Protocol Configuration Options information element is specified in 3GPP TS 29.275[ Proxy Mobile IPv6 (PMIPv6) based Mobility and Tunnelling protocols; Stage 3 ]  [26] and its GTPv2 coding is shown in figure 8.94-1. Figure 8.94-1: Additional Protocol Configuration Options Octets (5 to m) of the Additional Protocol Configuration Options IE are encoded as specified in 3GPP TS 29.275[ Proxy Mobile IPv6 (PMIPv6) based Mobility and Tunnelling protocols; Stage 3 ]  [26].