To implement the shallow packet inspection (SPI) or service awareness (SA) function, configure Layer
3/Layer 4 filters to enable the UGW9811 to filter and parse Layer 4/Layer 4 packets.
http://localhost:7904/pages/31185319/05/31185319/05/resources/public_sys-resources/icon-note.gif
NOTE: The GGSN, S-GW,
and P-GW all support this scenario.