Cisco ASR 5000 Series Administration Manual page 68

▀ Accounting and Charging Interfaces
"sn-volume-amt" counters will be re-initialized only when the fields are populated in EDRs. For example, consider the
following two EDR formats:
edr-format edr1
rule-variable http url priority 10
attribute sn-volume-amt ip bytes uplink priority 500
attribute sn-volume-amt ip bytes downlink priority 510
attribute sn-volume-amt ip pkts uplink priority 520
attribute sn-volume-amt ip pkts downlink priority 530
attribute sn-app-protocol priority 1000
exit
edr-format edr2
rule-variable http url priority 10
attribute sn-app-protocol priority 1000
exit
"sn-volume-amt counters" will be re-initialized only if these fields are populated in the EDRs. Now if edr2 is generated,
these counters will not be re-initialized. These will be re-initialized only when edr1 is generated. Also, note that only
those counters will be re-initialized which are populated in EDR. For example, in the following EDR format:
edr-format edr3
rule-variable http url priority 10
attribute sn-volume-amt ip bytes uplink priority 500
attribute sn-volume-amt ip bytes downlink priority 510
attribute sn-app-protocol priority 1000
exit
If edr3 is generated, only uplink bytes and downlink bytes counter will be re-initialized and uplink packets and
downlink packets will contain the previous values till these fields are populated (say when edr1 is generated).
For the voice call duration for SIP reporting requirements, ECS SIP analyzer keeps timestamp of the first INVITE that it
sees. It also keeps a timestamp when it sees a 200 OK for a BYE. When this 200 OK for a BYE is seen, SIP analyzer
triggers creation of an EDR of type ACS_EDR_VOIP_CALL_END_EVENT. This will also be triggered at the time of
SIP flow termination if no 200 OK for BYE is seen. In that case, the last packet time will be used in place of the 200
OK BYE timestamp. The EDR generation logic calculates the call duration based on the INVITE and end timestamps, it
also accesses the child RTP/RTCP flows to calculate the combined uplink/downlink bytes/packets counts and sets them
in the appropriate fields.
▄ Cisco ASR 5x00 Enhanced Charging Services Administration Guide
68
Enhanced Charging Service Overview