Cisco ASR 5000 Series Administration Manual page 21

Serving Gateway Overview
replicating user traffic in the event that Lawful Interception is required.
transport level packet marking.
user accounting and QCI granularity for charging.
uplink and downlink charging per UE, PDN, and QCI.
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Cisco ASR 5000 Series Serving Gateway Administration Guide ▄
Product Description ▀