F(packets)
F(bytes)
F(errors)
FA(ng_commands, NGC_COUNT)
F(timeout_sess)
F(managed_sess)
F(foreign_sess)
F(rejected_sess)
F(silent_timeout_sess)
F(offer_timeout_sess)
F(final_timeout_sess)
F(regular_term_sess)
F(forced_term_sess)
F(nopacket_relayed_sess)
F(oneway_stream_sess)
F(call_duration)