Cellular Network Infrastructure

The only capability related to CDR is the capability to write CDRs in CSV format. Related functionality is contained in http://git.osmocom.org/openbsc/tree/openbsc/src/gprs/sgsn_cdr.c which will write format like this:
"timestamp,imsi,imei,msisdn,cell_id,lac,hlr,event,pdp_duration,ggsn_addr,sgsn_addr,apni,eua_addr,vol_in,vol_out,charging_id\n"

• gprs attach
• routing area update
• gprs detach
• release of mm context
• PDP context activation
• PDP context deactivation
• PDP context termination
• PDP context release
• periodically with a configurable timer ("cdr interval <1-2147483647>")

The internal statistics counters for per-MM-context and per-PDP-context in/out bytes and packets should be readable via the CTRL interface, but this is currenrly broken due to bad choice of naming, see #2362

laforge wrote:

The only capability related to CDR is the capability to write CDRs in CSV format. Related functionality is contained in http://git.osmocom.org/openbsc/tree/openbsc/src/gprs/sgsn_cdr.c which will write format like this:
"timestamp,imsi,imei,msisdn,cell_id,lac,hlr,event,pdp_duration,ggsn_addr,sgsn_addr,apni,eua_addr,vol_in,vol_out,charging_id\n"

Please also see chapter 9.4 of http://ftp.osmocom.org/docs/latest/osmosgsn-usermanual.pdf describing this feature.

How do we proceed here?

We have the existing CSV format support as described above. It would be relatively easy to add TRAPs in similar fashion, i.e. send the CSV line as a trap (rathe than a file write). But are the existing/stated triggers

gprs attach
routing area update
gprs detach
release of mm context
PDP context activation
PDP context deactivation
PDP context termination
PDP context release
periodically with a configurable timer ("cdr interval <1-2147483647>")

sufficient?

ping?

Sorry for missing this! i recall working with the CSV was a little challenging if you want to rotate the file. Also the flexibility of sending over the network. The triggers and csv format you've described are great.

Implemented in:

remote:   https://gerrit.osmocom.org/5086 sgsn_cdr: Split log formatting into a snprintf function
remote:   https://gerrit.osmocom.org/5087 Add vty cmd 'cdr trap' to send CDR through CTRL iface

Waiting for review.

Merged. Available in osmo-sgsn 2e9ea50f7824e2028e44a27b72d5ae268cfc66f0.

TODO: Document it in osm-gsm-manuals. Also: Clean a bit the table which states that some csv columns only apply for events starting with "pdp-".

Documentation submitted in gerrit:

remote: New Changes:
remote:   https://gerrit.osmocom.org/5113 OsmoSGSN: configuration: Move pdp ctx specific CDR fields to its own table
remote:   https://gerrit.osmocom.org/5114 OsmoSGSN: configuration: Add missing pdp-periodic event
remote:   https://gerrit.osmocom.org/5115 OsmoSGSN: configuration: Document CDR CTRL interface

merged.